Implement a simple flow analysis. Tracks control flow of all statements with

the exception of "switch". Outputs warnings for unreachable code. Tracks also
"return" but doesn't currently make use of this information.

libsrc/common/getopt.c

@@ -29,7 +29,7 @@ int optopt;                     /* character checked for validity */
 char *optarg;                   /* argument associated with option */
 
 #define tell(s) fputs(*argv,stderr);fputs(s,stderr); \
-                fputc(optopt,stderr);fputc('\n',stderr);return(BADCH);
+                fputc(optopt,stderr);fputc('\n',stderr);return(BADCH)
 
 int __fastcall__ getopt (int argc, char* const* argv, const char* optstring)
 /* Get option letter from argument vector */