#117 5.1.5: lib name is giflib, instead of libgif

[balducci]

I also realize just now that the library file name is giflib, where it
should be libgif:

 ----8<----
 all: giflib.so giflib.a $(UTILS)
         cd doc; make

 $(UTILS):: giflib.a

 giflib.so: $(OBJECTS) $(HEADERS)
         $(CC) $(CFLAGS) -shared $(OFLAGS) -o giflib.so $(OBJECTS)
         ln -sf giflib.so giflib.so.$(LIBMAJOR).$(LIBMINOR).$(LIBPOINT)
         ln -sf giflib.so giflib.so.$(LIBMAJOR)

 giflib.a: $(OBJECTS) $(HEADERS)
         ar rcs giflib.a $(OBJECTS)
 ---->8----

cheers
gabriele