mesa/teximage: Make _mesa_format_no_online_compression public

It will be used by the ARB_internalformat_query2 implementation
to check if a certain compressed 'internalformat' is supported
by texture 'targets'.

Reviewed-by: Dave Airlie <airlied@redhat.com>

src/mesa/main/teximage.c

@@ -1266,7 +1266,7 @@ compressedteximage_only_format(const struct gl_context *ctx, GLenum format)
 /**
  * Return true if the format doesn't support online compression.
  */
-static bool
+bool
 _mesa_format_no_online_compression(const struct gl_context *ctx, GLenum format)
 {
    return _mesa_is_astc_format(format) ||

src/mesa/main/teximage.h

@@ -214,6 +214,9 @@ _mesa_legal_texture_base_format_for_target(struct gl_context *ctx,
                                            unsigned dimensions,
                                            const char *caller);
 
+bool
+_mesa_format_no_online_compression(const struct gl_context *ctx, GLenum format);
+
 GLboolean
 _mesa_is_renderable_texture_format(struct gl_context *ctx, GLenum internalformat);