added makefile for osx/linux

tools/mikktspace/Makefile

@@ -0,0 +1,14 @@
+# these are the default paths where hashlink is installed with `make install`
+ifndef HASHLINK
+HASHLINK=/usr/local/include
+endif
+
+ifndef HASHLINK_BIN
+HASHLINK=/usr/local/lib
+endif
+
+all: codegen
+	gcc -I $HASHLINK -I out out/main.c -lhl -L${HASHLINK_BIN}/fmt.hdll -o mikktspace
+
+codegen:
+	haxe mikktspace.hxml -D no-compilation