Allow NSS to be built with NO_NSPR_10_SUPPORT.

nss/lib/libpkix/pkix_pl_nss/module/pkix_pl_nsscontext.h

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 /*
  * pkix_pl_nsscontext.h
  *
  * NSSContext Object Type Definition
  *
  */
 
 
 #ifndef _PKIX_PL_NSSCONTEXT_H
 #define _PKIX_PL_NSSCONTEXT_H
 
 #include "pkix_pl_common.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 struct PKIX_PL_NssContextStruct {
         SECCertificateUsage certificateUsage;
-        PRArenaPool *arena;
+        PLArenaPool *arena;
         void *wincx;
         PKIX_UInt32 timeoutSeconds;
         PKIX_UInt32 maxResponseLength;
         PRTime crlReloadDelay;
         PRTime badDerCrlReloadDelay;
         CERTChainVerifyCallback chainVerifyCallback;
 };
 
 PKIX_Error *
 pkix_pl_NssContext_GetCertUsage
         (PKIX_PL_NssContext *nssContext, SECCertificateUsage *pCertUsage);
 
 /* XXX move the setter into the public header. */
 PKIX_Error *
 pkix_pl_NssContext_SetCertUsage
         (SECCertificateUsage certUsage, PKIX_PL_NssContext *nssContext);
 
 PKIX_Error *
 pkix_pl_NssContext_GetWincx(PKIX_PL_NssContext *nssContext, void **pWincx);
 
 /* XXX move the setter into the public header. */
 PKIX_Error *
 pkix_pl_NssContext_SetWincx(void *wincx, PKIX_PL_NssContext *nssContext);
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif /* _PKIX_PL_NSSCONTEXT_H */