nss/nspr: update build/autoconf/config.{guess,sub}

Update the file nss/nspr/build/autoconf/config.guess to the version 2014-03-23.
Update the file nss/nspr/build/autoconf/config.sub to the version 2014-05-01.
Create the file nss/nspr/build/autoconf/GPLv3.txt.

Change-Id: Ifc508a3c1bee57f810588d0013971e4bf1984c10
Reviewed-on: https://gerrit.libreoffice.org/10148Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

external/nss/UnpackedTarball_nss.mk

@@ -22,6 +22,7 @@ $(eval $(call gb_UnpackedTarball_add_patches,nss,\
 	$(if $(filter WNTGCC,$(OS)$(COM)),external/nss/nspr-4.9-build.patch.3 \
 		external/nss/nss-3.13.3-build.patch.3 \
 		external/nss/nss.mingw.patch.3) \
+        external/nss/nspr-build-config.patch \
 ))
 
 ifeq ($(COM_GCC_IS_CLANG)$(filter -fsanitize=address,$(CC)),TRUE-fsanitize=address)