idlc: MSVC: pragma warning: make more specific, remove obsolete

Change-Id: I0fbba0c1b12f9ade703ceee477dae4056fe9d31e
Reviewed-on: https://gerrit.libreoffice.org/48994
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

idlc/inc/idlctypes.hxx

@@ -39,10 +39,6 @@ class AstScope;
 AstDeclaration* scopeAsDecl(AstScope* pScope);
 AstScope* declAsScope(AstDeclaration* pDecl);
 
-#ifdef _MSC_VER
-#pragma warning( disable : 4541 )
-#endif
-
 // flags used for attributes, properties and services
 #define AF_INVALID          0x0000
 #define AF_READONLY         0x0001

idlc/source/parser.y

@@ -208,8 +208,7 @@ bool includes(AstDeclaration const * type1, AstDeclaration const * type2) {
 
 // Suppress any warnings from generated code:
 #if defined _MSC_VER
-#pragma warning(push, 1)
-#pragma warning(disable: 4273 4701 4702)
+#pragma warning(disable: 4702) // unreachable code
 #endif
 %}
 /*

idlc/source/scanner.l

@@ -252,7 +252,6 @@ static void parseLineAndFile(sal_Char* pBuf)
 #pragma GCC diagnostic ignored "-Wunused-function"
 #pragma GCC diagnostic ignored "-Wunused-label"
 #elif defined _MSC_VER
-#pragma warning(push, 1)
 /**/
 #ifdef yywrap
 #undef  yywrap