add NDEBUG to scons release flags + some pep8 cleanup for examples.

build_files/scons/config/freebsd7-config.py

@@ -180,8 +180,8 @@ CXXFLAGS = ['-pipe','-fPIC','-funsigned-char','-fno-strict-aliasing','-D_LARGEFI
 if WITH_BF_FFMPEG:
   # libavutil needs UINT64_C()
   CXXFLAGS += ['-D__STDC_CONSTANT_MACROS', ]
-REL_CFLAGS = ['-O2']
-REL_CCFLAGS = ['-O2']
+REL_CFLAGS = ['-DNDEBUG', '-O2']
+REL_CCFLAGS = ['-DNDEBUG', '-O2']
 ##BF_DEPEND = True
 ##
 ##AR = ar