macos: Bump the minimum deployment target to macOS 10.12

Since llvm/llvm-project#117252 and
llvm/llvm-project@186fac3,
part of the latest git main branch, LLDB uses std::shared_mutex.

On macOS, std::shared_mutex is only available since macOS 10.12.

This change raises the deployment target from 10.9 to 10.12.

Author: mstorsjo

build-lldb-mi.sh

@@ -111,7 +111,7 @@ fi
 
 if [ -n "$MACOS_REDIST" ]; then
     : ${MACOS_REDIST_ARCHS:=arm64 x86_64}
-    : ${MACOS_REDIST_VERSION:=10.9}
+    : ${MACOS_REDIST_VERSION:=10.12}
     ARCH_LIST=""
     NATIVE=
     for arch in $MACOS_REDIST_ARCHS; do

build-llvm.sh

@@ -248,7 +248,7 @@ fi
 
 if [ -n "$MACOS_REDIST" ]; then
     : ${MACOS_REDIST_ARCHS:=arm64 x86_64}
-    : ${MACOS_REDIST_VERSION:=10.9}
+    : ${MACOS_REDIST_VERSION:=10.12}
     ARCH_LIST=""
     NATIVE=
     for arch in $MACOS_REDIST_ARCHS; do

build-mingw-w64-tools.sh

@@ -79,7 +79,7 @@ if [ -n "$MACOS_REDIST" ]; then
         CFLAGS="-g -O2"
     fi
     : ${MACOS_REDIST_ARCHS:=arm64 x86_64}
-    : ${MACOS_REDIST_VERSION:=10.9}
+    : ${MACOS_REDIST_VERSION:=10.12}
     NONNATIVE_ARCH=
     for arch in $MACOS_REDIST_ARCHS; do
         CFLAGS="$CFLAGS -arch $arch"

install-wrappers.sh

@@ -104,7 +104,7 @@ fi
 
 if [ -n "$MACOS_REDIST" ]; then
     : ${MACOS_REDIST_ARCHS:=arm64 x86_64}
-    : ${MACOS_REDIST_VERSION:=10.9}
+    : ${MACOS_REDIST_VERSION:=10.12}
     for arch in $MACOS_REDIST_ARCHS; do
         WRAPPER_FLAGS="$WRAPPER_FLAGS -arch $arch"
     done