Allow NSS to be built with NO_NSPR_10_SUPPORT.

nss/lib/pki/pki3hack.c

Index: nss/lib/pki/pki3hack.c
===================================================================
--- nss/lib/pki/pki3hack.c	(revision 203524)
+++ nss/lib/pki/pki3hack.c	(working copy)
@@ -228,7 +228,7 @@
     SECItem secDER;
     SECItem secKey = { 0 };
     SECStatus secrv;
-    PRArenaPool *arena;
+    PLArenaPool *arena;
 
     SECITEM_FROM_NSSITEM(&secDER, der);
 
@@ -550,7 +550,7 @@
     if (cert) {
 	PRBool freeSlot = cert->ownSlot;
 	PK11SlotInfo *slot = cert->slot;
-	PRArenaPool *arena  = cert->arena;
+	PLArenaPool *arena  = cert->arena;
 	/* zero cert before freeing. Any stale references to this cert
 	 * after this point will probably cause an exception.  */
 	PORT_Memset(cert, 0, sizeof *cert);
@@ -585,7 +585,7 @@
 }
 
 static CERTCertTrust *
-cert_trust_from_stan_trust(NSSTrust *t, PRArenaPool *arena)
+cert_trust_from_stan_trust(NSSTrust *t, PLArenaPool *arena)
 {
     CERTCertTrust *rvTrust;
     unsigned int client;