Added a gcc preprocessor options -P, -P1

tcc -E -P
  do not output a #line directive, a gcc compatible option

tcc -E -P1
  don't follow a gcc preprocessor style and do output a standard
  #line directive. In such case we don't lose a location info when
  we going to compile a resulting file wtith a compiler not
  understanding a gnu style line info.

tcc.h

@@ -656,6 +656,11 @@ struct TCCState {
 
     /* output file for preprocessing (-E) */
     FILE *ppfp;
+    enum {
+	LINE_MACRO_OUTPUT_FORMAT_GCC,
+	LINE_MACRO_OUTPUT_FORMAT_NONE,
+	LINE_MACRO_OUTPUT_FORMAT_STD,
+    }    Pflag; 
 
     /* for -MD/-MF: collected dependencies for this compilation */
     char **target_deps;