CTest: exclude /showIncludes notes when scraping logs

My last related commit e5e3f3d4 (CTest: filter /showIncludes output from
ninja compile launcher, 2013-12-01) filtered /showIncludes messages from
the generated xml output but they also need to be filtered in
ScrapeLog().  Otherwise they are being detected as warnings when using
compilers withs english diagnostics.

Source/CTest/cmCTestLaunch.cxx

@@ -587,8 +587,7 @@ void cmCTestLaunch::DumpFileToXML(std::ostream& fxml,
 
   while(cmSystemTools::GetLineFromStream(fin, line))
     {
-    if(OptionFilterPrefix.size() && cmSystemTools::StringStartsWith(
-      line.c_str(), OptionFilterPrefix.c_str()))
+    if(MatchesFilterPrefix(line))
       {
       continue;
       }
@@ -676,6 +675,11 @@ bool cmCTestLaunch::ScrapeLog(std::string const& fname)
   std::string line;
   while(cmSystemTools::GetLineFromStream(fin, line))
     {
+    if(MatchesFilterPrefix(line))
+      {
+      continue;
+      }
+
     if(this->Match(line.c_str(), this->RegexWarning) &&
        !this->Match(line.c_str(), this->RegexWarningSuppress))
       {
@@ -700,6 +704,17 @@ bool cmCTestLaunch::Match(std::string const& line,
   return false;
 }
 
+//----------------------------------------------------------------------------
+bool cmCTestLaunch::MatchesFilterPrefix(std::string const& line) const
+{
+  if(this->OptionFilterPrefix.size() && cmSystemTools::StringStartsWith(
+      line.c_str(), this->OptionFilterPrefix.c_str()))
+    {
+    return true;
+    }
+  return false;
+}
+
 //----------------------------------------------------------------------------
 int cmCTestLaunch::Main(int argc, const char* const argv[])
 {

Source/CTest/cmCTestLaunch.h

@@ -88,6 +88,7 @@ private:
   bool ScrapeLog(std::string const& fname);
   bool Match(std::string const& line,
              std::vector<cmsys::RegularExpression>& regexps);
+  bool MatchesFilterPrefix(std::string const& line) const;
 
   // Methods to generate the xml fragment.
   void WriteXML();