Allow different --libtool options from multiple gnulib-tool invocations. * modules/crypto/gc (Makefile.am): Don't test GL_COND_LIBTOOL, since gnulib-tool already eliminates lib_LDFLAGS augmentations for non-libtool libraries. * modules/striconv (Makefile.am): Likewise. * modules/striconveh (Makefile.am): Likewise. * modules/termcap (Makefile.am): Likewise. * modules/terminfo (Makefile.am): Likewise.