[PATCH] jit: fix link on OS X and Solaris (PR jit/64089 and PR jit/84288)

[FX]

> Does this fix the jit linker issues on OS X and Solaris?

The patch fails to bootstrap on x86_64-apple-darwin17. gcc/config.log says:

gcc_cv_ld_version_script=no
ld_version_script_option='--version-script’

gcc/Makefile says:

LD_VERSION_SCRIPT_OPTION = --version-script
LD_SONAME_OPTION = -install_name

which makes it try to link with:

	      -Wl,--version-script,../../trunk/gcc/jit/libgccjit.map \
	      -Wl,-install_name,libgccjit.so.0

which fails with: ld: unknown option: --version-script

I think the patch to gcc/configure.ac should be:

+AC_MSG_CHECKING(linker --version-script option)
+gcc_cv_ld_version_script=no
+ld_version_script_option=''


FX