cmSystemTools: Drop unused StringEndsWith method

It has no callers and we can inherit one from KWSys SystemTools anyway.

Source/cmSystemTools.cxx

@@ -1409,15 +1409,6 @@ std::string cmSystemTools::ConvertToRunCommandPath(const char* path)
 #endif
 }
 
-bool cmSystemTools::StringEndsWith(const char* str1, const char* str2)
-{
-  if ( !str1 || !str2 || strlen(str1) < strlen(str2) )
-    {
-    return 0;
-    }
-  return !strncmp(str1 + (strlen(str1)-strlen(str2)), str2, strlen(str2));
-}
-
 // compute the relative path from here to there
 std::string cmSystemTools::RelativePath(const char* local, const char* remote)
 {

Source/cmSystemTools.h

@@ -336,8 +336,6 @@ public:
   // be used when RunCommand is called from cmake, because the
   // running cmake needs paths to be in its format
   static std::string ConvertToRunCommandPath(const char* path);
-  //! Check if the first string ends with the second one.
-  static bool StringEndsWith(const char* str1, const char* str2);
 
   /** compute the relative path from local to remote.  local must
       be a directory.  remote can be a file or a directory.