SVN commit 8309 by fluffy:
- Use another way to avoid hardcoded QMAKE_CC/QMAKE_CXX
previous patch's logic allows to use any ports compiler, but fails with
base gcc when configuration script uses ${CC}="" by default
M +4 -1 Makefile
M +10 -6 files/patch-qt4-before-ports-in-mkspecs.diff