[RSB Graphics Library] add patch for library source

[QIAO YANG]

Hi,

I'm now working on moving the graphic libraries from rtems-graphic-tool-kits into rsb, based on the existing work for libjpeg and the rtems-graphic-tool-kits's buid script.

The port of libpng, libtiff, freetype2 can be review on my github:
https://github.com/yangqiao/rtems-source-builder/commits/graphics

While I've got some problems when trying to add patch for source code.
As what I've read from other cfg files, we should first "patch add" the needed patches, then "patch setup" to apply them. When I try to add the patch under source-builder/patches/,  it warned me that the path doesn't have a proper protocl such as https, git .... And I've found that some patches of gdb ..etc are in rtems-tools and the sb-build retrieve them from the git server. How can I add a patch from source-builder/patches/ instead of uploading to rtems-tools ? Or maybe I missed something?

Thanks in advance

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