src/logger.c: Define _GNU_SOURCE and include <stdio.h> for asprintf().
src/logger.c: Define _GNU_SOURCE and include <stdio.h> for asprintf().

Note: The changelog seems to indicate moves away from GNU extensions, 
presumably for portability reasons.  So we might want to consider 
alternatives to asprintf().


git-svn-id: 5a113f46df058f8047e288f4f3e948d899353d9a@442 410355f2-c4ea-45de-a5b5-301721f902b9

mwcampbell/prs,mwcampbell/prs,mwcampbell/prs