Don't hardcode things in the Makefile.

Index: Makefile.linux
--- Makefile.linux.orig
+++ Makefile.linux
@@ -1,11 +1,5 @@
 # GNU Makefile for Linux
 
-CC=gcc
-AS=as
-AR=ar
-RANLIB=ranlib
-
-CFLAGS =-Wall -std=gnu99 -g -O2
 CFLAGS+=-DNDEBUG
 CFLAGS_LIB =-DUNSF_BUILD=1
 #CFLAGS_LIB+=-fPIC -DPIC
