[CMake] Re-land #102671 after the flaky test is disabled

Reland #102671 after the other attempted fixes are all flawed in some
build configurations. The previous try for the same commit was breaking
a flaky tests under ASAN which is not marked as unsupported. This fix
should be good to go now.

Fixes AIX bot for DynamicLibraryTests failure.

Author: cachemeifyoucan

llvm/unittests/Support/DynamicLibrary/CMakeLists.txt

@@ -17,10 +17,9 @@ set_output_directory(DynamicLibraryLib
 
 add_llvm_unittest(DynamicLibraryTests
   DynamicLibraryTest.cpp
-
-  EXPORT_SYMBOLS
   )
 target_link_libraries(DynamicLibraryTests PRIVATE DynamicLibraryLib)
+export_executable_symbols(DynamicLibraryTests)
 
 function(dynlib_add_module NAME)
   add_library(${NAME} MODULE