* Makefile.in (MODULE_LDFLAGS): New variable.
* aclocal.m4 (grub_PROG_LD_BUILD_ID_NONE): New macro. Check if
the linker accepts --build-id=none.
* configure.ac: Call grub_PROG_LD_BUILD_ID_NONE. Substitute
MODULE_LDFLAGS.
* genmk.rb: Use MODULE_LDFLAGS when linking modules.