Merge bitcoin#21884: fuzz: Remove unused --enable-danger-fuzz-link-all option

fa27d6d fuzz: Remove unused --enable-danger-fuzz-link-all option (MarcoFalke)

Pull request description:

  Remove the unused build option, which was *dangerous* (as the name implies). Also remove the fuzzbuzz config, which was never used as part of this repo and seems redundant now that we integrate with oss-fuzz.

ACKs for top commit:
  practicalswift:
    cr ACK fa27d6d: patch looks correct and rationale makes sense
  hebasto:
    ACK fa27d6d, I have reviewed the code and it looks OK, I agree it can be merged.

Tree-SHA512: 9bd65ed6a76d13d8d9c7a88aaae30f701215d5d0619693a3115d5ec350808aaf6a1aa4737466a5b96f3948513ec4d063808fe16219818366720e247880a15177

Author: fanquake

.fuzzbuzz.yml

@@ -185,12 +185,6 @@ AC_ARG_ENABLE([fuzz-binary],
     [enable_fuzz_binary=$enableval],
     [enable_fuzz_binary=yes])
 
-AC_ARG_ENABLE([danger_fuzz_link_all],
-    AS_HELP_STRING([--enable-danger-fuzz-link-all],
-    [Danger! Modifies source code. Needs git and gnu sed installed. Link each fuzz target (default no).]),
-    [enable_danger_fuzz_link_all=$enableval],
-    [enable_danger_fuzz_link_all=no])
-
 AC_ARG_WITH([qrencode],
   [AS_HELP_STRING([--with-qrencode],
   [enable QR code support (default is yes if qt is enabled and libqrencode is found)])],
@@ -1818,7 +1812,6 @@ AM_CONDITIONAL([ENABLE_TRACING],[test x$have_sdt = xyes])
 AM_CONDITIONAL([ENABLE_TESTS],[test x$BUILD_TEST = xyes])
 AM_CONDITIONAL([ENABLE_FUZZ],[test x$enable_fuzz = xyes])
 AM_CONDITIONAL([ENABLE_FUZZ_BINARY],[test x$enable_fuzz_binary = xyes])
-AM_CONDITIONAL([ENABLE_FUZZ_LINK_ALL],[test x$enable_danger_fuzz_link_all = xyes])
 AM_CONDITIONAL([ENABLE_QT],[test x$bitcoin_enable_qt = xyes])
 AM_CONDITIONAL([ENABLE_QT_TESTS],[test x$BUILD_TEST_QT = xyes])
 AM_CONDITIONAL([ENABLE_BENCH],[test x$use_bench = xyes])

configure.ac

@@ -398,11 +398,6 @@ univalue_test_object_CPPFLAGS = -I$(srcdir)/$(UNIVALUE_INCLUDE_DIR_INT)
 univalue_test_object_LDFLAGS = -static $(LIBTOOL_APP_LDFLAGS)
 endif
 
-if ENABLE_FUZZ_LINK_ALL
-all-local: $(FUZZ_BINARY)
-	bash ./test/fuzz/danger_link_all.sh
-endif
-
 %.cpp.test: %.cpp
 	@echo Running tests: $$(\
 	  cat $< | \