autobuild macosx: fix missing freetype library

Author: jtsiomb

examples/simple/Makefile

@@ -3,16 +3,19 @@ bin = simple
 root = ../..
 
 CFLAGS = -pedantic -Wall -g -I$(root)/src
-LDFLAGS = -L$(root) -Wl,-rpath,$(root) -ldrawtext -lfreetype $(libgl)
+LDFLAGS = -L$(root) -Wl,-rpath,$(root) $(lib) $(libgl)
 
 font = serif.ttf
 
 sys := $(shell uname -s | sed 's/MINGW.*/mingw/')
 ifeq ($(sys), Darwin)
+	lib = -ldrawtext
 	libgl = -framework OpenGL -framework GLUT
 else ifeq ($(sys), mingw)
+	lib = -ldrawtext -lfreetype
 	libgl = -lopengl32 -lglu32 -lfreeglut
 else
+	lib = -ldrawtext
 	libgl = -lGL -lGLU -lglut -lm
 endif