Merge pull request #62 from smp79/glvnd

Add modern GLVND support for UNIX platform

Author: hizzlekizzle

Makefile.libretro

@@ -1,6 +1,7 @@
 DEBUG=0
 FRONTEND_SUPPORTS_RGB565=1
 HAS_GPU ?= 1
+USE_GLVND ?= 0
 
 ifeq ($(platform),)
  platform = unix
@@ -64,6 +65,8 @@ ifeq ($(platform), unix)
  ifeq ($(HAS_GLES), 1)
  GL_LIB := -lGLESv2
  GLES :=1
+ else ifeq ($(USE_GLVND), 1)
+ GL_LIB := -lOpenGL
  else
  GL_LIB := -lGL
  endif