dont let target flags bleed into build flags

fix by Bertrand Jacquin

http://bugs.gentoo.org/226035

--- netem/Makefile
+++ netem/Makefile
@@ -2,6 +2,7 @@ DISTGEN = maketable normal pareto paretonormal
 DISTDATA = normal.dist pareto.dist paretonormal.dist experimental.dist
 
 HOSTCC ?= $(CC)
+CCOPTS  = $(CBUILD_CFLAGS)
 LDLIBS += -lm 
 
 all: $(DISTGEN) $(DISTDATA)