Revert "[CMake] Fix DynamicLibraryTests exports symbol when plugins are enabled (#102941)"

This reverts commit a9604cd.

The export list in unit-tests will break sanitizer build since that
requires more symbols than listed in the export file.

Author: cachemeifyoucan

llvm/unittests/Support/DynamicLibrary/CMakeLists.txt

@@ -15,17 +15,13 @@ set_output_directory(DynamicLibraryLib
   LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}
   )
 
-set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/DynamicLibraryTests.exports)
-
 add_llvm_unittest(DynamicLibraryTests
   DynamicLibraryTest.cpp
 
   EXPORT_SYMBOLS
   )
 target_link_libraries(DynamicLibraryTests PRIVATE DynamicLibraryLib)
 
-unset(LLVM_EXPORTED_SYMBOL_FILE)
-
 function(dynlib_add_module NAME)
   add_library(${NAME} MODULE
     PipSqueak.cpp