Fix our tree for -Wmissing-include-dirs.

gcc47: Add libssp and libssp_noshared

These libraries were not part of the gcc 4.4 system compiler set.
Some pkgsrc packages assume the ssp libraries come with the compiler,
so add them to the gcc 4

gcc47: Add libssp and libssp_noshared

These libraries were not part of the gcc 4.4 system compiler set.
Some pkgsrc packages assume the ssp libraries come with the compiler,
so add them to the gcc 4.7 library set.

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