Improved long optarg

[dapimentel]

Given the following simple patch to long.c, the undesirable feature of parsing optional arguments for long options is demonstrated:

diff --git a/examples/long.c b/examples/long.c
index 00993fa..4ba63b9 100644
--- a/examples/long.c
+++ b/examples/long.c
@@ -48,7 +48,12 @@ int main(int argc, char **argv)
         }
     }
 
-    /* Print remaining arguments. */
+    printf("amend : %s\n", amend ? "true" : "false");
+    printf("brief : %s\n", brief ? "true" : "false");
+    printf("color : %s\n", color);
+    printf("delay : %d\n", delay);
+
+    printf("Print remaining arguments:\n");
     while ((arg = optparse_arg(&options)))
         printf("%s\n", arg);

First use case fails to reset the delay value.

%> long.x --delay 10 -a bob
amend : true
brief : false
color : white
delay : 1
Print remaining arguments:
10
bob

Second use case resets the delay value.

%> long.x --delay=10 -a bob
amend : true
brief : false
color : white
delay : 10
Print remaining arguments:
bob

Both use cases should behave the same as the second.

This preferred behavior is as simple as activating the included patch.