configure.ac: enable building GLES1 and GLES2 by default

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
diff --git a/configure.ac b/configure.ac
index 5594548..84b404e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -714,15 +714,15 @@
     [enable_opengl="$enableval"],
     [enable_opengl=yes])
 AC_ARG_ENABLE([gles1],
-    [AS_HELP_STRING([--enable-gles1],
-        [enable support for OpenGL ES 1.x API @<:@default=disabled@:>@])],
+    [AS_HELP_STRING([--disable-gles1],
+        [disable support for OpenGL ES 1.x API @<:@default=enabled@:>@])],
     [enable_gles1="$enableval"],
-    [enable_gles1=no])
+    [enable_gles1=yes])
 AC_ARG_ENABLE([gles2],
-    [AS_HELP_STRING([--enable-gles2],
-        [enable support for OpenGL ES 2.x API @<:@default=disabled@:>@])],
+    [AS_HELP_STRING([--disable-gles2],
+        [disable support for OpenGL ES 2.x API @<:@default=enabled@:>@])],
     [enable_gles2="$enableval"],
-    [enable_gles2=no])
+    [enable_gles2=yes])
 
 AC_ARG_ENABLE([dri],
     [AS_HELP_STRING([--enable-dri],