invoke patch-specs.sh in the gcc/final install stage. Patch up OpenWrts own...

invoke patch-specs.sh in the gcc/final install stage. Patch up OpenWrts own cross toolchains to always search headers and libraries in $STAGING_DIR, this should solve most issues with missing headers, indirect linking and not found libraries. At a later stage, all -I and -L flags will be purged from TARGET_LDFLAGS and TARGET_CPPFLAGS.

SVN-Revision: 29768