support missingok dependency bit

--- ./lib/depends.c.orig	2011-02-15 13:10:59.000000000 +0000
+++ ./lib/depends.c	2011-05-10 16:06:39.000000000 +0000
@@ -448,8 +448,13 @@ retry:
     }
 
 unsatisfied:
-    rc = 1;	/* dependency is unsatisfied */
-    rpmdsNotify(dep, NULL, rc);
+    if (rpmdsFlags(dep) & RPMSENSE_MISSINGOK) {
+	rc = 0; /* dependency is unsatisfied, but just a hint. */
+	rpmdsNotify(dep, _("(hint skipped)"), rc);
+    } else {
+	rc = 1;	/* dependency is unsatisfied */
+	rpmdsNotify(dep, NULL, rc);
+    }
 
 exit:
     return rc;
--- ./lib/rpmds.h.orig	2011-05-10 16:09:22.000000000 +0000
+++ ./lib/rpmds.h	2011-05-10 16:08:04.000000000 +0000
@@ -68,6 +68,7 @@ typedef rpmFlags rpmsenseFlags;
     RPMSENSE_SCRIPT_POSTUN | \
     RPMSENSE_SCRIPT_VERIFY | \
     RPMSENSE_FIND_REQUIRES | \
+    RPMSENSE_MISSINGOK | \
     RPMSENSE_RPMLIB | \
     RPMSENSE_KEYRING | \
     RPMSENSE_PRETRANS | \