libRemarks.{so,dylib}: remove Remarks.dylib.exports

Remarks.exports is only intended for NOT (BUILD_SHARED_LIBS OR LLVM_LINK_LLVM_DYLIB)
builds.

For (unintended use case) BUILD_SHARED_LIBS OR LLVM_LINK_LLVM_DYLIB (the latter
is used by some Linux distros), the library defines just one symbol on ELF.
There is no need to use a version script.

I think this is a more proper solution than D139932 and fixes `symbol not
defined` errors after lld default change D135402.

llvm/tools/remarks-shlib/CMakeLists.txt

@@ -9,9 +9,7 @@ if(LLVM_ENABLE_PIC)
     libremarks.cpp
     )
 
-  if (LLVM_LINK_LLVM_DYLIB)
-    set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/Remarks.dylib.exports)
-  else()
+  if (NOT (BUILD_SHARED_LIBS OR LLVM_LINK_LLVM_DYLIB))
     set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/Remarks.exports)
   endif()
 

llvm/tools/remarks-shlib/Remarks.dylib.exports

@@ -1 +0,0 @@
-LLVMRemarkVersion