#2 allow override of CC CFLAGS CXX and CXXFLAGS

[Jack Thomasson]

the default gcc on my build system is 2.95.2 (yes, i
know it is old). but i have gcc-3.2.2 installed as
well. this patch allows me to build the RPM while
overriding the default compiler settings, e.g.,

CC=gcc-3.2.2 CXX=g++-3.2.2 rpm -bb mxflib.spec

or

configure CC=gcc-3.2.2 CXX=g++-3.2.2 CXXFLAGS='-O2 -g
-mcpu=i486'

:{)}

[Jack Thomasson]

configure-CXXFLAGS.patch