test: configure/make shouldn't build GL/GLES1/GLES2 programs if unsupported.

test/configure

@@ -589,6 +589,9 @@ XLIB
 GLES2LIB
 GLESLIB
 GLLIB
+OPENGL_TARGETS
+OPENGLES2_TARGETS
+OPENGLES1_TARGETS
 CPP
 XMKMF
 SDL_CONFIG
@@ -3901,17 +3904,23 @@ $as_echo "$have_opengles2" >&6; }
 GLLIB=""
 GLESLIB=""
 GLES2LIB=""
+OPENGLES1_TARGETS="UNUSED"
+OPENGLES2_TARGETS="UNUSED"
+OPENGL_TARGETS="UNUSED"
 if test x$have_opengles = xyes; then
     CFLAGS="$CFLAGS -DHAVE_OPENGLES"
     GLESLIB="$XPATH -lGLESv1_CM"
+    OPENGLES1_TARGETS="TARGETS"
 fi
 if test x$have_opengles2 = xyes; then
     CFLAGS="$CFLAGS -DHAVE_OPENGLES2"
     #GLES2LIB="$XPATH -lGLESv2"
+    OPENGLES2_TARGETS="TARGETS"
 fi
 if test x$have_opengl = xyes; then
     CFLAGS="$CFLAGS -DHAVE_OPENGL"
     GLLIB="$XPATH $SYS_GL_LIBS"
+    OPENGL_TARGETS="TARGETS"
 fi
 
 
@@ -3919,6 +3928,9 @@ fi
 
 
 
+
+
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for TTF_Init in -lSDL2_ttf" >&5
 $as_echo_n "checking for TTF_Init in -lSDL2_ttf... " >&6; }
 if ${ac_cv_lib_SDL2_ttf_TTF_Init+:} false; then :