* config/linux.h (LIB_SPEC): Add -lc for -shared if
        USE_GNULIBC_1 is not defined.
        * config/sparc/linux.h; Ditto.
        * config/sparc/linux64.h (LIB_SPEC): Add -lc for -shared.
        * config/alpha/linux-elf.h (LIB_SPEC): New. Defined if
        USE_GNULIBC_1 is not defined.

From-SVN: r17895