Fix mongo-objc-driver warning when compiled with gcc

mongo-objc-driver-snprintf.diff

warning: '0' flag ignored with precision and '%X' printf format
--- Sources/MODBinary.m.orig	2011-11-08 15:00:08.000000000 -0600
+++ Sources/MODBinary.m	2011-11-10 17:54:06.000000000 -0600
@@ -47,7 +47,7 @@
     bufferString = malloc(([_data length] * 2) + 1);
     count = [_data length];
     for(ii = 0; ii < count; ii++) {
-        snprintf(bufferString + (ii * 2), 3, "%0.2X", bytes[ii]);
+        snprintf(bufferString + (ii * 2), 3, "%.2X", bytes[ii]);
     }
     bufferString[(ii * 2) + 1] = 0;
     if (pretty) {
--- Sources/MODDBRef.m.orig	2011-11-08 15:00:08.000000000 -0600
+++ Sources/MODDBRef.m	2011-11-10 17:54:06.000000000 -0600
@@ -42,7 +42,7 @@
     count = sizeof(_idValue);
     bufferString = malloc((count * 2) + 1);
     for(ii = 0; ii < count; ii++) {
-        snprintf(bufferString + (ii * 2), 3, "%0.2X", bytes[ii]);
+        snprintf(bufferString + (ii * 2), 3, "%.2X", bytes[ii]);
     }
     bufferString[(ii * 2) + 1] = 0;
     result = [NSString stringWithFormat:@"Dbref(\"%@\", \"%@\")", _refValue, bufferString];
@@ -65,7 +65,7 @@
     count = sizeof(_idValue);
     bufferString = malloc((count * 2) + 1);
     for(ii = 0; ii < count; ii++) {
-        snprintf(bufferString + (ii * 2), 3, "%0.2X", bytes[ii]);
+        snprintf(bufferString + (ii * 2), 3, "%.2X", bytes[ii]);
     }
     bufferString[(ii * 2) + 1] = 0;
     if (pretty) {