gnulib-tool: Apply libgnu.{,l}a specific CFLAGS to all its object files.
* gnulib-tool.sh (func_emit_initmacro_end): Define
${macro_prefix}_${libname}_{LIBOBJS,LTLIBOBJS,LIBOBJDEPS} macros, that
include libname in the base name of the object files.
(func_emit_lib_Makefile_am): Use ${macro_prefix}_${libname}_*LIBOBJS
values instead of ${macro_prefix}_*LIBOBJS values.
* pygnulib/GLEmiter.py (GLEmiter.initmacro_end): Define
{macro_prefix_arg}_{libname}_{LIBOBJS,LTLIBOBJS,LIBOBJDEPS} macros, that
include libname in the base name of the object files.
(GLEmiter.lib_Makefile_am):Use {macro_prefix}_{libname}_*LIBOBJS
values instead of {macro_prefix}_*LIBOBJS values.