gcc: Fix the glibc search path for Linuxbrew
gcc: Fix the glibc search path for Linuxbrew

Set LIBRARY_PATH so that GCC knows where to find the glibc libraries
and object files, such as crt1.o, crti.o and crtn.o.

See Linuxbrew/linuxbrew#107
See Linuxbrew/linuxbrew#200

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