Move #undef NOGDI from wglew_head.h to glew_head.c

auto/src/glew_head.c

@@ -6,6 +6,14 @@
 #elif defined(GLEW_EGL)
 #  include <GL/eglew.h>
 #elif defined(_WIN32)
+/*
+ * If NOGDI is defined, wingdi.h won't be included by windows.h, and thus
+ * wglGetProcAddress won't be declared. It will instead be implicitly declared,
+ * potentially incorrectly, which we don't want.
+ */
+#  if defined(NOGDI)
+#    undef NOGDI
+#  endif
 #  include <GL/wglew.h>
 #elif !defined(__ANDROID__) && !defined(__native_client__) && !defined(__HAIKU__) && (!defined(__APPLE__) || defined(GLEW_APPLE_GLX))
 #  include <GL/glxew.h>

auto/src/wglew_head.h

@@ -12,14 +12,6 @@
 #  ifndef WIN32_LEAN_AND_MEAN
 #    define WIN32_LEAN_AND_MEAN 1
 #  endif
-/*
- * If NOGDI is defined, wingdi.h won't be included by windows.h, and thus
- * wglGetProcAddress won't be declared. It will instead be implicitly declared
- * incorrectly, which we don't want.
- */
-#  if defined(NOGDI)
-#    undef NOGDI
-#  endif
 #include <windows.h>
 #  undef WIN32_LEAN_AND_MEAN
 #endif