LexerParser: Suppress LCC warnings in generated code

Source/cmStandardLexer.h

@@ -50,6 +50,10 @@
 #  endif
 #endif
 
+#if defined(__LCC__)
+#  pragma diag_suppress 1873 /* comparison between signed and unsigned */
+#endif
+
 #if defined(__NVCOMPILER)
 #  pragma diag_suppress 111 /* statement is unreachable */
 #  pragma diag_suppress 550 /* variable set but never used */