fix bug with -o introduced in 2ac318b

Author: andrew-taylor

compile_time_python/options.py

@@ -381,7 +381,7 @@ def parse_arg(arg, remaining_args, options):
     elif arg == "--help":
         print()
         sys.exit(0)
-    elif arg == "-x":
+    elif arg.startswith("-o"):
         if arg == "-o":
             if remaining_args:
                 options.object_pathname = remaining_args.pop(0)

tests/run_time_errors/unterminated_strcat.c

@@ -1,8 +1,7 @@
 #include <string.h>
-#include <unistd.h>
 
 int main(void) {
     char c = 'd';
     char s[5];
     strcat(s, &c);
-}
+}