dpkg: Use less as pager

Debian traditionaly uses /usr/bin/pager as the system pager, which is a
link to the user preferred pager. This is a Debianism.

Without this patch:

root@qt5122:~# dpkg -l
sh: pager: command not found
dpkg-query: error: showing package list on pager subprocess returned error exit status 127

(From OE-Core rev: 580d7f3325af0569239cdd9757ca77fbe6f29146)

Signed-off-by: Ricardo Ribalda Delgado <ricardo@ribalda.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/dpkg/dpkg/pager.patch

@@ -0,0 +1,21 @@
+pager: Use less instead of pager
+
+pager is a Debianism. Istead use directly pager.
+
+Upstream-Status: Inappropriate [OE-Core integration specific]
+
+Suggested-by: Burton, Ross <ross.burton@intel.com>
+Signed-off-by: Ricardo Ribalda <ricardo@ribalda.com>
+diff --git a/lib/dpkg/dpkg.h b/lib/dpkg/dpkg.h
+index 2bb067a..6cbce80 100644
+--- a/lib/dpkg/dpkg.h
++++ b/lib/dpkg/dpkg.h
+@@ -95,7 +95,7 @@ DPKG_BEGIN_DECLS
+ #define MAXUPDATES         250
+ 
+ #define DEFAULTSHELL        "sh"
+-#define DEFAULTPAGER        "pager"
++#define DEFAULTPAGER        "less"
+ 
+ #define MD5HASHLEN           32
+ #define MAXTRIGDIRECTIVE     256

meta/recipes-devtools/dpkg/dpkg_1.19.4.bb

@@ -12,6 +12,7 @@ SRC_URI = "${DEBIAN_MIRROR}/main/d/${BPN}/${BPN}_${PV}.tar.xz \
            file://0006-add-musleabi-to-known-target-tripets.patch \
            file://0007-dpkg-deb-build.c-Remove-usage-of-clamp-mtime-in-tar.patch \
            file://0001-dpkg-Support-muslx32-build.patch \
+           file://pager.patch \
            "
 SRC_URI_append_class-native = " \
                                 file://tweak-options-require-tar-1.27.patch \