99690f build/gcc.full.build: fix gcc.{host,stage1}.mingw_w64 build.

Authored and Committed by Lucio Andrés Illanes Albornoz (arab, vxp) 7 years ago
    build/gcc.full.build: fix gcc.{host,stage1}.mingw_w64 build.
    patches/gcc.stage1.mingw_w64.local.patch: force libiberty/pex-unix.c when targeting mingw_w64.
    subr/build.subr: create ${PREFIX}/man -> share/man symlink as w/ ${PREFIX_NATIVE}.
    subr/rtl.subr: obtain target from ${PKG_TARGET} in set_build_dir().
    vars/build.vars: adds ${PKG_TARGET} var; reenables gcc.stage1.mingw_w64.
    
        
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