Obey MISSINGOK flag for dependencies. Backport from rpm-4.4.7.

Index: lib/depends.c
===================================================================
--- lib/depends.c.orig
+++ lib/depends.c
@@ -518,8 +518,13 @@ 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:
     /*
@@ -827,6 +832,8 @@ static inline const char * identifyDepen
 	return "Requires(postun):";
     if (f & RPMSENSE_SCRIPT_VERIFY)
 	return "Requires(verify):";
+    if (f & RPMSENSE_MISSINGOK)
+	return "Requires(hint):";
     if (f & RPMSENSE_FIND_REQUIRES)
 	return "Requires(auto):";
     return "Requires:";
Index: lib/rpmds.h
===================================================================
--- lib/rpmds.h.orig
+++ lib/rpmds.h
@@ -73,6 +73,7 @@ typedef	enum rpmsenseFlags_e {
     RPMSENSE_SCRIPT_POSTUN | \
     RPMSENSE_SCRIPT_VERIFY | \
     RPMSENSE_FIND_REQUIRES | \
+    RPMSENSE_MISSINGOK | \
     RPMSENSE_SCRIPT_PREP | \
     RPMSENSE_SCRIPT_BUILD | \
     RPMSENSE_SCRIPT_INSTALL | \