include: Install linux/if_alg.h for user-space crypto API

Signed-off-by: Miloslav Trmač <mitr@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index 831c463..b3cca8c 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -154,6 +154,7 @@
 header-y += if.h
 header-y += if_addr.h
 header-y += if_addrlabel.h
+header-y += if_alg.h
 header-y += if_arcnet.h
 header-y += if_arp.h
 header-y += if_bonding.h