Fix most clang -Wextra-semi-stmt warnings in C++ files

Suppress one in code generated by flex.

Source/LexerParser/cmDependsJavaLexer.cxx

@@ -869,7 +869,7 @@ Modify cmDependsJavaLexer.cxx:
 /* Replace the lexer input function.  */
 #undef YY_INPUT
 #define YY_INPUT(buf, result, max_size) \
-  { result = yyextra->LexInput(buf, max_size); }
+  do { result = yyextra->LexInput(buf, max_size); } while (0)
 
 /* Include the set of tokens from the parser.  */
 #include "cmDependsJavaParserTokens.h"