crosstool-ng: Drop gcc and glibc version information from ${PV}
crosstool-ng: Drop gcc and glibc version information from ${PV}

This is needed to make it possible to properly handle ${PV} variable
before applying USE flags, as glibc version typically is set by USE flag.

This makes gcc recipe compatible with the ${INCOMPATIBLE_RECIPES} feature.

(refs #278)

hundeboll/core,hundeboll/core,sknsean/core,hundeboll/core,sknsean/core,hundeboll/core,sknsean/core,sknsean/core,diorcety/oe-lite-core,sknsean/core,diorcety/oe-lite-core