These version checks are about the Clang the plugins are built /against/

...not the (Clang) compiler they are being built /with/.  (Also simplifies the
checking #if code.)

Change-Id: I416321be4ef4478785be40571f81500fd3b6feb8

compilerplugins/clang/nullptr.cxx

@@ -193,7 +193,7 @@ bool Nullptr::isFromCIncludeFile(SourceLocation spellingLocation) const {
 }
 
 bool Nullptr::isMacroBodyExpansion(SourceLocation location) const {
-#if (__clang_major__ == 3 && __clang_minor__ >= 3) || __clang_major__ > 3
+#if CLANG_VERSION >= 30300
     return compiler.getSourceManager().isMacroBodyExpansion(location);
 #else
     return location.isMacroID()