Update Makefile

Fix:
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make
cc -g sctpscan.c -o sctpscan -L/sw/lib/ -I /sw/include/glib-2.0/ -I /sw/lib/glib-2.0/include/ -I/usr/include/glib-2.0/ -I/usr/lib/glib-2.0/include/ -lglib-2.0
In file included from /usr/include/glib-2.0/glib/galloca.h:34:0,
                 from /usr/include/glib-2.0/glib.h:32,
                 from sctpscan.c:326:
/usr/include/glib-2.0/glib/gtypes.h:34:24: fatal error: glibconfig.h: No such file or directory
compilation terminated.
make: *** [sctpscan] Error 1
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