package/libnpth: add host variant

This is needed to support a host build of gnupg2.  It is not directly
selectable.

Signed-off-by: Ben Hutchings <ben.hutchings@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libnpth/libnpth.mk

@@ -13,5 +13,7 @@ LIBNPTH_INSTALL_STAGING = YES
 # 0001-Fix-INSERT_EXPOSE_RWLOCK_API-for-musl-C-library.patch
 LIBNPTH_AUTORECONF = YES
 LIBNPTH_CONF_OPTS = --disable-tests
+HOST_LIBNPTH_CONF_OPTS = --disable-tests
 
 $(eval $(autotools-package))
+$(eval $(host-autotools-package))