app-crypt/pinentry: depend on gnome-keyring with USE=gtk

With USE=gtk and only app-crypt/gcr:4 installed, I get:
```
$ G_MESSAGES_DEBUG=all G_DEBUG=all pinentry-gnome3
(process:503360): Gcr-DEBUG: 09:38:27.242: opening prompt
(process:503360): Gcr-DEBUG: 09:38:27.242: connecting to bus
(process:503360): Gcr-DEBUG: 09:38:27.245: connected to bus
(process:503360): Gcr-DEBUG: 09:38:27.245: calling BeginPrompting method on prompter
(process:503360): Gcr-DEBUG: 09:38:27.251: failed to register prompt org.gnome.keyring.SystemPrompter: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.keyring.SystemPrompter was not provided by any .service files
(process:503360): Gcr-DEBUG: 09:38:27.251: closing prompt
```

If I install app-crypt/gcr:0, it starts to work, but that's because
app-crypt/gcr:0 depends on gnome-base/gnome-keyring.

We could switch the dep in pinentry to gcr:0 so we don't pull in 2 gcr
slots, but then we'd have to modify configure to avoid automagic on gcr:4,
and my hope is that the issue here will be fixed upstream at some point
(though it's not clear to me whose fault it is, see e.g.
https://gitlab.gnome.org/GNOME/gnome-keyring/-/issues/139 too).

TL;DR: depend on gnome-base/gnome-keyring to make pinentry-gnome3 work
again.

Closes: https://bugs.gentoo.org/960307
Signed-off-by: Sam James <sam@gentoo.org>

app-crypt/pinentry/pinentry-1.3.2-r1.ebuild

@@ -0,0 +1,122 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/gnupg.asc
+inherit autotools qmake-utils verify-sig
+
+DESCRIPTION="Simple passphrase entry dialogs which utilize the Assuan protocol"
+HOMEPAGE="https://gnupg.org/related_software/pinentry/"
+SRC_URI="mirror://gnupg/${PN}/${P}.tar.bz2"
+SRC_URI+=" verify-sig? ( mirror://gnupg/${PN}/${P}.tar.bz2.sig )"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+IUSE="caps efl emacs gtk keyring ncurses qt6 wayland X"
+
+DEPEND="
+	>=dev-libs/libassuan-2.1:=
+	>=dev-libs/libgcrypt-1.6.3
+	>=dev-libs/libgpg-error-1.17
+	efl? ( dev-libs/efl[X] )
+	keyring? ( app-crypt/libsecret )
+	ncurses? ( sys-libs/ncurses:= )
+	qt6? (
+		dev-qt/qtbase:6[gui,widgets]
+		wayland? (
+			kde-frameworks/kguiaddons:6
+			kde-frameworks/kwindowsystem:6
+		)
+	)
+"
+RDEPEND="
+	${DEPEND}
+	gtk? (
+		app-crypt/gcr:4[gtk]
+		gnome-base/gnome-keyring
+	)
+"
+BDEPEND="
+	sys-devel/gettext
+	virtual/pkgconfig
+	verify-sig? ( sec-keys/openpgp-keys-gnupg )
+"
+PDEPEND="emacs? ( app-emacs/pinentry )"
+IDEPEND=">=app-eselect/eselect-pinentry-0.7.4"
+
+DOCS=( AUTHORS ChangeLog NEWS README THANKS TODO )
+
+PATCHES=(
+	"${FILESDIR}/${PN}-1.0.0-AR.patch"
+	"${FILESDIR}/${PN}-1.3.0-automagic.patch" # bug #819939, bug #837719
+)
+
+src_prepare() {
+	default
+
+	eautoreconf
+}
+
+src_configure() {
+	unset FLTK_CONFIG
+
+	local myeconfargs=(
+		$(use_enable efl pinentry-efl)
+		$(use_enable emacs pinentry-emacs)
+		$(use_enable keyring libsecret)
+		$(use_enable gtk pinentry-gnome3)
+		$(use_enable ncurses fallback-curses)
+		$(use_enable ncurses pinentry-curses)
+		$(use_enable qt6 pinentry-qt)
+		$(use_with X x)
+
+		--enable-pinentry-tty
+		--disable-kf5-wayland
+		--disable-pinentry-fltk
+		--disable-pinentry-gtk2
+		--disable-pinentry-qt5
+		--disable-qtx11extras
+
+		ac_cv_path_GPGRT_CONFIG="${ESYSROOT}/usr/bin/${CHOST}-gpgrt-config"
+
+		$("${S}/configure" --help | grep -- '--without-.*-prefix' | sed -e 's/^ *\([^ ]*\) .*/\1/g')
+	)
+
+	if use qt6 ; then
+		export PATH="$(qt6_get_bindir):${PATH}"
+		export QTLIB="$(qt6_get_libdir):${QTLIB}"
+		export MOC="$(qt6_get_libdir)/qt6/libexec/moc"
+
+		myeconfargs+=(
+			$(use_enable wayland kf6-wayland)
+		)
+	else
+		myeconfargs+=(
+			--disable-kf6-wayland
+		)
+	fi
+
+	econf "${myeconfargs[@]}"
+}
+
+src_install() {
+	default
+
+	rm "${ED}"/usr/bin/pinentry || die
+
+	# The preferred Qt implementation upstream gets installed as just 'qt'.
+	# Make a symlink for eselect-pinentry and friends.
+	if use qt6 ; then
+		dosym pinentry-qt /usr/bin/pinentry-qt6
+	fi
+}
+
+pkg_postinst() {
+	eselect pinentry update ifunset
+}
+
+pkg_postrm() {
+	eselect pinentry update ifunset
+}