This fixes gamepad mappings being included in GLFW binaries that would
then never use them because they were for a different platform.
(cherry picked from commit 0c90e1a33f)
The SDL2 2.0.5+ controller GUID 03000000790000000600000000000000 matches
many devices with different layouts and element counts but with the same
chipset. This issue is still being resolved upstream. In the meantime
this removes those mappings from GLFW to avoid confusion and errors.
SDL upstream issue: https://bugzilla.libsdl.org/show_bug.cgi?id=4545
Related to #1583.
(cherry picked from commit b69fb99031)