Add git sha to odin version command

Makefile

@@ -1,6 +1,7 @@
+GIT_SHA=$(shell git rev-parse --short HEAD)
 DISABLED_WARNINGS=-Wno-switch -Wno-pointer-sign -Wno-tautological-constant-out-of-range-compare -Wno-tautological-compare -Wno-macro-redefined
 LDFLAGS=-pthread -ldl -lm -lstdc++
-CFLAGS=-std=c++11
+CFLAGS=-std=c++11 -DGIT_SHA=\"$(GIT_SHA)\"
 CC=clang
 
 OS=$(shell uname)
@@ -20,5 +21,8 @@ debug:
 release:
 	$(CC) src/main.cpp $(DISABLED_WARNINGS) $(CFLAGS) -O3 -march=native $(LDFLAGS) -o odin
 
+nightly:
+	$(CC) src/main.cpp $(DISABLED_WARNINGS) $(CFLAGS) -DNIGHTLY -O3 -march=native $(LDFLAGS) -o odin
+