arm.h still have CPU feature detection for Microsoft Compiler that is used by WinCE. Since we don't have the target for WinCE, we should remove it.
Also, even if you need it for Win32/arm that is Windows Mobile and Windows IOT in feature, this is unnecessary. Win32/arm ABI requires thumb2+NEON at least.
MozReview-Commit-ID: 6dYjIRY0Suo
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extra : rebase_source : 34db8ed7d3d60bafdfc735b036e891554a0e56c5