Add .arm directives for the GLX entrypoint stubs.
The ARMv7 assembly dispatch stubs for GLX are written in normal ARM, but they're missing an .arm directive, so if the compiler is building Thumb by default, then it'll crash.
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The ARMv7 assembly dispatch stubs for GLX are written in normal ARM, but they're missing an .arm directive, so if the compiler is building Thumb by default, then it'll crash.