Merge bitcoin/bitcoin#28783: build: remove -bind_at_load usage

3c61c60 build: Add an old hack to remove bind_at_load from libtool. (Cory Fields)
4525760 build: remove -bind_at_load usage (fanquake)

Pull request description:

  This is deprecated on macOS:
  ```bash
  ld: warning: -bind_at_load is deprecated on macOS
  ```
  and likely redundant anyways, given the behaviour of dyld3.

  Unfortunately libtool is still injecting a `-bind_at_load`, because it's version check is broken:
  ```bash
  # Don't allow lazy linking, it breaks C++ global constructors
  # But is supposedly fixed on 10.4 or later (yay!).
  if test CXX = "$tagname"; then
    case ${MACOSX_DEPLOYMENT_TARGET-10.0} in
      10.[0123])
        func_append compile_command " $wl-bind_at_load"
        func_append finalize_command " $wl-bind_at_load"
      ;;
    esac
  fi
  ```
  so this adds another change to strip them out at the end of configure.

  Note that anywhere the ld64 warnings are being emitted, we are already not adding this flag to our hardened ldflags, because of `-Wl,-fatal_warnings`.

ACKs for top commit:
  theuni:
    utACK 3c61c60.
  hebasto:
    ACK 3c61c60, tested on macOS Sonoma 14.1.1 (23B81, Apple M1) and Ubuntu 23.10 (cross-compiling for macOS). Also I've verified the actual diff in the `libtool` script.

Tree-SHA512: 98e6a095dc2d2409f8ec3b9d462e0db3643d7873d7903a12f8acd664829e7e84e797638556fa42ca8ebc1003f13a38fe9bb8a2a50cecfa991155da818574bf08

Author: fanquake

configure.ac

@@ -1002,7 +1002,6 @@ dnl "ad_strip" as the symbol for the entry point.
 if test "$TARGET_OS" = "darwin"; then
   AX_CHECK_LINK_FLAG([-Wl,-dead_strip], [CORE_LDFLAGS="$CORE_LDFLAGS -Wl,-dead_strip"], [], [$LDFLAG_WERROR])
   AX_CHECK_LINK_FLAG([-Wl,-dead_strip_dylibs], [CORE_LDFLAGS="$CORE_LDFLAGS -Wl,-dead_strip_dylibs"], [], [$LDFLAG_WERROR])
-  AX_CHECK_LINK_FLAG([-Wl,-bind_at_load], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-bind_at_load"], [], [$LDFLAG_WERROR])
   AX_CHECK_LINK_FLAG([-Wl,-fixup_chains], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-fixup_chains"], [], [$LDFLAG_WERROR])
 fi
 
@@ -1970,6 +1969,17 @@ case ${OS} in
    ;;
 esac
 
+dnl An old hack similar to a98356fee to remove hard-coded
+dnl bind_at_load flag from libtool
+case $host in
+  *darwin*)
+     AC_MSG_RESULT([Removing -Wl,bind_at_load from libtool.])
+     sed < libtool > libtool-2 '/bind_at_load/d'
+     mv libtool-2 libtool
+     chmod 755 libtool
+   ;;
+esac
+
 echo
 echo "Options used to compile and link:"
 echo "  external signer = $use_external_signer"

contrib/devtools/test-security-check.py

@@ -129,11 +129,11 @@ def test_MACHO(self):
                 (1, executable+': failed NOUNDEFS PIE CONTROL_FLOW'))
             self.assertEqual(call_security_check(cc, source, executable, ['-Wl,-no_pie','-fstack-protector-all', '-Wl,-fixup_chains']),
                 (1, executable+': failed PIE CONTROL_FLOW'))
-            self.assertEqual(call_security_check(cc, source, executable, ['-Wl,-no_pie','-Wl,-bind_at_load','-fstack-protector-all', '-Wl,-fixup_chains']),
+            self.assertEqual(call_security_check(cc, source, executable, ['-Wl,-no_pie','-fstack-protector-all', '-Wl,-fixup_chains']),
                 (1, executable+': failed PIE CONTROL_FLOW'))
-            self.assertEqual(call_security_check(cc, source, executable, ['-Wl,-no_pie','-Wl,-bind_at_load','-fstack-protector-all', '-fcf-protection=full', '-Wl,-fixup_chains']),
+            self.assertEqual(call_security_check(cc, source, executable, ['-Wl,-no_pie','-fstack-protector-all', '-fcf-protection=full', '-Wl,-fixup_chains']),
                 (1, executable+': failed PIE'))
-            self.assertEqual(call_security_check(cc, source, executable, ['-Wl,-pie','-Wl,-bind_at_load','-fstack-protector-all', '-fcf-protection=full', '-Wl,-fixup_chains']),
+            self.assertEqual(call_security_check(cc, source, executable, ['-Wl,-pie','-fstack-protector-all', '-fcf-protection=full', '-Wl,-fixup_chains']),
                 (0, ''))
         else:
             # arm64 darwin doesn't support non-PIE binaries, control flow or executable stacks
@@ -143,7 +143,7 @@ def test_MACHO(self):
                 (1, executable+': failed NOUNDEFS Canary'))
             self.assertEqual(call_security_check(cc, source, executable, ['-Wl,-flat_namespace','-fstack-protector-all', '-Wl,-fixup_chains']),
                 (1, executable+': failed NOUNDEFS'))
-            self.assertEqual(call_security_check(cc, source, executable, ['-Wl,-bind_at_load','-fstack-protector-all', '-Wl,-fixup_chains']),
+            self.assertEqual(call_security_check(cc, source, executable, ['-fstack-protector-all', '-Wl,-fixup_chains']),
                 (0, ''))