Exclude version symbols for static libomp

[omalyshe]

Summary

We use symbol versioning for GNU-compatibility but libgomp has versioned symbols only in the shared library but not in the static.

Moreover, version symbols in the static library can cause an error at link time.

[jlpeyton]

LGTM

openmp/trunk/runtime/CMakeLists.txt

if(WIN32 AND NOT LIBOMP_ENABLE_SHARED)
   libomp_error_say("Static libraries requested but not available on Windows")
 endif()
 
 if(LIBOMP_USE_ITT_NOTIFY AND NOT LIBOMP_ENABLE_SHARED)
   message(STATUS "ITT Notify not supported for static libraries - forcing ITT Notify off")
   set(LIBOMP_USE_ITT_NOTIFY FALSE)
 endif()
 
+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
 set(LIBOMP_OMPT_DEBUG FALSE CACHE BOOL
   "Trace OMPT initialization?")
 set(LIBOMP_OMPT_SUPPORT FALSE CACHE BOOL
   "OMPT-support?")
 set(LIBOMP_OMPT_BLAME TRUE CACHE BOOL
   "OMPT-blame?")
 set(LIBOMP_OMPT_TRACE TRUE CACHE BOOL