gnupg: update to 2.4.6

MSYS2 already has a `/usr/bin/yat2m`, however, that version does not
understand the `--gnupgorg` option that gnupg requires to build the
documentation, and its `configure` script does not reject a too-old
version. So let's force-override it with the version gnupg ships itself.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

gnupg/PKGBUILD

@@ -1,7 +1,7 @@
 # Maintainer: Alexey Pavlov <alexpux@gmail.com>
 
 pkgname=gnupg
-pkgver=2.4.5
+pkgver=2.4.6
 pkgrel=1
 pkgdesc='Complete and free implementation of the OpenPGP standard'
 provides=('dirmngr' "gnupg2=${pkgver}")
@@ -48,7 +48,7 @@ depends=('bzip2'
 source=("https://gnupg.org/ftp/gcrypt/${pkgname}/${pkgname}-${pkgver}.tar.bz2"{,.sig}
         'gnupg-2.2.8-msys2.patch'
         '0001-gnupg-2.2.9-have-drive-letters.patch')
-sha256sums=('f68f7d75d06cb1635c336d34d844af97436c3f64ea14bcb7c869782f96f44277'
+sha256sums=('95acfafda7004924a6f5c901677f15ac1bda2754511d973bb4523e8dd840e17a'
             'SKIP'
             '6e6dfa9a64d4986f47dfb6937addb51e2e22f55c762559f104eae5a226bdd43f'
             'bf9d6675024fa21003f48fc706a5f80799362b7370db0a6de19be36cf73919a5')
@@ -82,7 +82,8 @@ build() {
     --disable-libdns \
     --enable-maintainer-mode
 
-  make
+  # avoid using the system-wide yat2m, which may not understand --gnupgorg
+  make YAT2M=./yat2m
 }
 
 check() {