[llvm-rc] Allow ALT on non-virtkey accelerators (#143374) While https://learn.microsoft.com/en-us/windows/win32/menurc/accelerators-resource specifies that ALT only applies to virtkeys, this doesn't seem to be the case in reality. https://learn.microsoft.com/en-us/windows/win32/menurc/using-keyboard-accelerators contains an example that uses this combination: "B", ID_ACCEL5, ALT ; ALT_SHIFT+B Also Microsoft also includes such cases in their repo of test cases: https://github.com/microsoft/Windows-classic-samples/blob/263dd514ad215d0a40d1ec44b4df84b30ec11dcf/Samples/Win7Samples/begin/sdkdiff/sdkdiff.rc#L161-L164 Also MS rc.exe doesn't warn/error about this. However if applying SHIFT or CONTROL on a non-virtkey accelerator, MS rc.exe does produce this warning: warning RC4203 : SHIFT or CONTROL used without VIRTKEY Hence, keep the checks for SHIFT and CONTROL, but remove the checks for ALT, which seems to have been incorrect. This fixes one aspect of https://github.com/llvm/llvm-project/issues/143157.
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