Remove hardcoded optimizations

Index: Makefile
--- Makefile.orig
+++ Makefile
@@ -6,7 +6,7 @@
 #CC ?= clang
 
 # Enable compiler warnings. This is an absolute minimum.
-CFLAGS += -Wall -std=c99 -O3 #-Wextra
+CFLAGS += -Wall -std=c99 #-Wextra
 
 # Define your optimization flags.
 #
