Remove hardcoded GCC optimization flags

Remove hardcoded GCC optimization flags

Forwarded: not-needed
Last-Update: 2015-11-17

This is necessary in order to make DEB_BUILD_OPTIONS=noopt work as expected.

Note that the hack on llvm-config --cxxflags is not absolutely needed, because
the -O2 that it brings come before the -O0 brought by dpkg-buildflags. But I
leave it for clarity.
Last-Update: 2015-11-17
Gbp-Pq: Name support-noopt.patch