fix library names for Windows

wscript

@@ -19,13 +19,15 @@ def build(bld):
     defines += ['VERSION="%s"' % VERSION]
     includes = [p for p in bld.path.ant_glob("src/**", dir = True) if os.path.isdir(p.abspath())]
     includes += ["libs/glcxx/include"]
+    libs = []
     if platform.system() == "Linux":
         defines += ["PLATFORM_LINUX"]
+        libs += ["dl", "GL"]
     elif re.search(r'MINGW', platform.system()):
         defines += ["PLATFORM_WINDOWS"]
+        libs += ["opengl32"]
     defines += ['GLCXX_GL_INCLUDE="gl3w.h"']
     sources = bld.path.ant_glob(["src/**/*.cc", "src/**/*.c", "libs/glcxx/src/glcxx/*"])
-    libs = ["dl", "GL"]
     bld(features = "c cprogram cxx cxxprogram",
         target = APPNAME,
         source = sources,