Tools/vmap4_extractor: do not add gcc/clang compile flags when using MSVC and fix a little warning

src/tools/vmap4_extractor/CMakeLists.txt

@@ -15,7 +15,7 @@ file(GLOB_RECURSE sources *.cpp *.h)
 add_definitions("-DIOMAP_DEBUG")
 
 # build setup currently only supports libmpq 0.4.x
-if( NOT WIN32 )
+if( NOT MSVC )
   add_definitions("-Wall")
   add_definitions("-ggdb")
   add_definitions("-O3")

src/tools/vmap4_extractor/wdtfile.cpp

@@ -37,7 +37,7 @@ WDTFile::WDTFile(char* file_name, char* file_name1):WDT(WorldMpq, file_name)
     filename.append(file_name1,strlen(file_name1));
 }
 
-bool WDTFile::init(char */*map_id*/, unsigned int mapID)
+bool WDTFile::init(char* /*map_id*/, unsigned int mapID)
 {
     if (WDT.isEof())
     {