honour already set C(XX)?_FLAGS

that way we can pass additional flags from the build-environment
Merge pull request #80 from evgeni/honour-cflags

honour already set C(XX)?_FLAGS
Skip a line from /proc/net/unix if the name contains bogus binary data. fixes #77
fix potential memory leak when invalid line is skipped
Merge tag '0.1.77' into debian
0.1.77? sure!