gnupg: mv scdaemon to subpackage and add dependency on libusb

And fix so that configure script can find libusb headers. This makes
it possible to access smartcards with gpg/scdaemon when running as
root. It is not without flaws though, the gpg-agent daemon has to be
manually stopped sometimes to make the card appear. Also seems quite
hard to get some things to work when running gpg-agent and scdaemon as
root: I haven't been able to do remote forwarding or sig git commits.

packages/gnupg/build.sh

@@ -3,12 +3,13 @@ TERMUX_PKG_DESCRIPTION="Implementation of the OpenPGP standard for encrypting an
 TERMUX_PKG_LICENSE="GPL-2.0"
 TERMUX_PKG_MAINTAINER="@termux"
 TERMUX_PKG_VERSION=2.3.3
-TERMUX_PKG_REVISION=1
+TERMUX_PKG_REVISION=2
 TERMUX_PKG_SRCURL=https://www.gnupg.org/ftp/gcrypt/gnupg/gnupg-${TERMUX_PKG_VERSION}.tar.bz2
 TERMUX_PKG_SHA256=5789b86da6a1a6752efb38598f16a77af51170a8494039c3842b085032e8e937
 TERMUX_PKG_DEPENDS="libassuan, libbz2, libgcrypt, libgnutls, libgpg-error, libksba, libnpth, libsqlite, readline, pinentry, resolv-conf, zlib"
 TERMUX_PKG_CONFLICTS="gnupg2 (<< 2.2.9-1), dirmngr (<< 2.2.17-1)"
 TERMUX_PKG_REPLACES="gnupg2 (<< 2.2.9-1), dirmngr (<< 2.2.17-1)"
+TERMUX_PKG_SUGGESTS="scdaemon"
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
 --disable-ldap
 --enable-sqlite

packages/gnupg/configure.patch

@@ -1,8 +1,18 @@
-diff -u -r ../gnupg-2.1.14/configure ./configure
---- ../gnupg-2.1.14/configure	2016-07-14 10:03:06.000000000 -0400
-+++ ./configure	2016-07-14 19:20:04.539115863 -0400
-@@ -14729,13 +14729,6 @@
- done
+--- ../gnupg-2.3.3/configure	2021-10-12 17:15:17.000000000 +0200
++++ ./configure	2021-12-27 23:19:18.022214970 +0100
+@@ -9281,8 +9281,8 @@
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking libusb include dir" >&5
+ $as_echo_n "checking libusb include dir... " >&6; }
+    usb_incdir_found="no"
+-   for _incdir in "" "/usr/include/libusb-1.0" \
+-       "/usr/local/include/libusb-1.0" "/usr/pkg/include/libusb-1.0"; do
++   for _incdir in "" "@TERMUX_PREFIX@/include/libusb-1.0" \
++       "@TERMUX_PREFIX@/local/include/libusb-1.0" "@TERMUX_PREFIX@/pkg/include/libusb-1.0"; do
+      _libusb_save_cppflags=$CPPFLAGS
+      if test -n "${_incdir}"; then
+        CPPFLAGS="-I${_incdir} ${CPPFLAGS}"
+@@ -15048,13 +15048,6 @@
+ esac
  
  
 -if test "$have_android_system" = yes; then

packages/gnupg/scdaemon.subpackage.sh

@@ -0,0 +1,5 @@
+TERMUX_SUBPKG_INCLUDE="libexec/scdaemon share/man/man1/scdaemon.1.gz"
+TERMUX_SUBPKG_DESCRIPTION="Daemon invoked by gpg to manage smartcards"
+TERMUX_SUBPKG_DEPENDS="libgcrypt, libksba, libgpg-error, libassuan, libnpth, libusb"
+TERMUX_SUBPKG_CONFLICTS="gnupg (<< 2.3.3-2)"
+TERMUX_SUBPKG_REPLACES="gnupg (<< 2.3.3-2)"