[OMPT] Disable by default on Windows

[Hahnfeld]

Summary

This is broken per PR36561 and PR36574, so disable it for now until
somebody interested can take a look. OMPT can still be activated manually
by passing -DLIBOMP_OMPT_SUPPORT=ON during configuration.

[protze.joachim]

I second this change, since this should hopefully allow to include OpenMP in the release build, until someone can fix the build of OMPT on Windows.

[Hahnfeld]

If nobody objects I'd like to commit this later today and try to get this backported before rc1.

openmp/trunk/README.rst

 
 **LIBOMP_USE_INTERNODE_ALIGNMENT** = ``OFF|ON``
   Align certain data structures on 4096-byte.  This option is useful on
   multi-node systems where a small ``CACHE_LINE`` setting leads to false sharing.
 
 **LIBOMP_OMPT_SUPPORT** = ``ON|OFF``
   Include support for the OpenMP Tools Interface (OMPT). 
   This option is supported and ``ON`` by default for x86, x86_64, AArch64, and 
-  PPC64 on Linux*, Windows*, and macOS*.
+  PPC64 on Linux* and macOS*.
   This option is ``OFF`` if this feature is not supported for the platform.
 
 **LIBOMP_OMPT_OPTIONAL** = ``ON|OFF``
   Include support for optional OMPT functionality.  This option is ignored if
   **LIBOMP_OMPT_SUPPORT** is ``OFF``.
 
 **LIBOMP_STATS** = ``OFF|ON``
   Include stats-gathering code.

openmp/trunk/runtime/CMakeLists.txt

 if(LIBOMP_USE_VERSION_SYMBOLS AND (NOT LIBOMP_ENABLE_SHARED) )
   message(STATUS "Version symbols not supported for static libraries - forcing Version symbols functionality off")
   set (LIBOMP_USE_VERSION_SYMBOLS FALSE)
 endif()
 
 # OMPT-support defaults to ON for OpenMP 5.0+ and if the requirements in
 # cmake/config-ix.cmake are fulfilled.
 set(OMPT_DEFAULT FALSE)
-if ((${LIBOMP_OMP_VERSION} GREATER 49) AND (LIBOMP_HAVE_OMPT_SUPPORT))
+if ((${LIBOMP_OMP_VERSION} GREATER 49) AND (LIBOMP_HAVE_OMPT_SUPPORT) AND (NOT WIN32))
   set(OMPT_DEFAULT TRUE)
 endif()
 set(LIBOMP_OMPT_SUPPORT ${OMPT_DEFAULT} CACHE BOOL
   "OMPT-support?")
 
 set(LIBOMP_OMPT_DEBUG FALSE CACHE BOOL
   "Trace OMPT initialization?")
 set(LIBOMP_OMPT_OPTIONAL TRUE CACHE BOOL