Fixed bug #193

The attached patch is mostly cosmetic: Currently, we always add both -framework
OpenGL and -framework AGL for Mac OS X command line builds.

However, the former is only used for the Cocoa video driver, and the latter
only for the Carbon video driver (as far as I can tell, at least). Hence the
attached patch modifies configure.in so that each only gets added to the list
of frameworks if the corresponding video driver is enabled.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401632

configure.in

@@ -1444,9 +1444,12 @@ CheckMacGL()
         AC_DEFINE(SDL_VIDEO_OPENGL)
         case "$host" in
             *-*-darwin*)
-                EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,OpenGL"
-                # The following is probably not available in Darwin:
-                EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,AGL"
+                if test x$enable_video_cocoa = xyes; then
+                    EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,OpenGL"
+                fi
+                if test x$enable_video_carbon = xyes; then
+                    EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-framework,AGL"
+                fi
         esac
     fi
 }