Patch for building BLAKE2 b2sum on OS X

BLAKE2.patch

$ git diff
diff --git a/b2sum/makefile b/b2sum/makefile
index 806cc72..1171005 100644
--- a/b2sum/makefile
+++ b/b2sum/makefile
@@ -1,5 +1,5 @@
-CC=gcc
-CFLAGS=-std=c99 -O3 -march=native -I../sse -static -fopenmp 
+CC=gcc-5
+CFLAGS=-std=c99 -O3 -march=native -I../sse -fopenmp 
 LIBS=
 #FILES=blake2sum.c ../ref/blake2b-ref.c ../ref/blake2s-ref.c ../ref/blake2bp-ref.c ../ref/blake2sp-ref.c 
 FILES=b2sum.c ../sse/blake2b.c ../sse/blake2s.c ../sse/blake2bp.c ../sse/blake2sp.c