Use C-style comments

git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@1127 632fc199-4ca6-4c93-a231-07263d6284db

jcstest.c

@@ -78,7 +78,7 @@ int main(void)
   jerr.pub.output_message = my_output_message;
 
   if(setjmp(jerr.jb)) {
-    // this will execute if libjpeg has an error
+    /* this will execute if libjpeg has an error */
     jcs_valid = 0;
     goto done;
   }
@@ -105,7 +105,7 @@ int main(void)
   #endif
 
   if(setjmp(jerr.jb)) {
-    // this will execute if libjpeg has an error
+    /* this will execute if libjpeg has an error */
     jcs_alpha_valid = 0;
     goto done2;
   }