build: adjust LLDB and clang library naming on Windows (#185084)

Ensure that use of the GNU driver does not change the library name on
Windows. We would check the build tools being MSVC rather than targeting
Windows to select the output name.

(cherry picked from commit 687e66c989)

clang/tools/libclang/CMakeLists.txt

@@ -120,7 +120,7 @@ if (MSVC AND ENABLE_SHARED AND ENABLE_STATIC)
   unset(ENABLE_STATIC)
 endif()
 
-if(MSVC)
+if(WIN32 AND NOT MINGW)
   set(output_name "libclang")
 else()
   set(output_name "clang")

lldb/source/API/CMakeLists.txt

@@ -265,7 +265,7 @@ elseif (LLDB_EXPORT_ALL_SYMBOLS)
   add_llvm_symbol_exports(liblldb ${exported_symbol_file})
 endif()
 
-if (NOT MSVC)
+if(NOT WIN32 OR MINGW)
   set_target_properties(liblldb
     PROPERTIES
     OUTPUT_NAME lldb