[Bug 49775] New: sapi51.h and sapi51.idl (from which it is claimed to be generated in original Windows SDK) are missing from the sdk

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49775

Bug ID: 49775
           Summary: sapi51.h and sapi51.idl (from which it is claimed to
                    be generated in original Windows SDK) are missing from
                    the sdk
           Product: Wine
           Version: 5.16
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: sapi
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

In the original sapi51.h it is claimed that it is generated by MIDL.
Unfortunately, sapi51.idl is missing from Windows SDK, so we cannot generate
it. This prevents building sapi5 modules with free open-source toolchains,
essentially forcing developers to use Visual Studio.