[xmlsec] support builds against standalone NSS dev build

[Aleksey Sanin <aleksey src gnome org>]

commit f26e572e085924f55c8201110791371d95635974
Author: Aleksey Sanin <aleksey aleksey com>
Date:   Mon Mar 2 15:07:45 2015 -0800

    support builds against standalone NSS dev build

 configure.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.in b/configure.in
index 7a68c52..7126284 100644
--- a/configure.in
+++ b/configure.in
@@ -759,7 +759,7 @@ if test "z$NSS_FOUND" = "zno" ; then
 
     if test "z$NSS_INCLUDES_FOUND" = "zyes" -a "z$NSS_LIBS_FOUND" = "zyes" ; then
        OLD_CPPFLAGS=$CPPFLAGS
-       CPPFLAGS="$NSS_CFLAGS"
+       CPPFLAGS="$NSPR_CFLAGS $NSS_CFLAGS"
        AC_EGREP_CPP(yes,[
           #include <nss.h>
           #if NSS_VMAJOR >= 3 && NSS_VMINOR >= 2