Makefile gaining flexibility to allow for platform-specific hardening

[smoe]

--- grabix-0.0git20130718.orig/Makefile
+++ grabix-0.0git20130718/Makefile
@@ -1,2 +1,7 @@
+LDFLAGS+= -lstdc++ -lz
+CFLAGS+=-Wall
all:

•   gcc -Wall -O2 -o grabix grabix.cpp bgzf.c -lstdc++ -lz
  

•   gcc $(CFLAGS) -o grabix grabix.cpp bgzf.c $(LDFLAGS)
  

  +clean:

•   rm -f grabix