Use ARM mode for dispatch stubs on ARMv6 and ARMv7

Merged Kyle Brenneman requested to merge kbrenneman/libglvnd:armv7-use-arm-stubs into master

This changes the ARMv7 dispatch stubs to use ARM mode instead of Thumb.

The same instructions actually work either way, with the only difference being the _GLOBAL_OFFSET_TABLE_ offsets at the end. Since we have the stubs 128-byte aligned, using ARM doesn't actually make the binary any larger, either.

Using ARM, though, means that the dispatch stubs can work for ARMv6 as well.

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