[PATCH qemu 1/2] fix #7722: d/{control,rules}: restore PNG support

[Fiona Ebner <f.ebner@proxmox.com>]

PNG support is required for screendump and is advertised by VNC when
available. In Proxmox VE 8, the libpng-dev build dependency was pulled
in implicitly via
> i   sbuild-build-depends-main-dummy Depends libsdl1.2-dev
> i A libsdl1.2-dev                   Depends libcaca-dev
> i A libcaca-dev                     Depends libslang2-dev
> i A libslang2-dev                   Depends libpng-dev
and then CONFIG_PNG would be auto-enabled during build. Add back the
missing build dependency to fix the regression and be explicit
about enabling PNG support.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
---
 debian/control | 1 +
 debian/rules   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/debian/control b/debian/control
index e3fc9a7847..4c4b8fa4a1 100644
--- a/debian/control
+++ b/debian/control
@@ -20,6 +20,7 @@ Build-Depends: debhelper-compat (= 13),
                libnuma-dev,
                libpci-dev,
                libpixman-1-dev,
+               libpng-dev,
                libproxmox-backup-qemu0-dev (>= 1.3.0),
                librbd-dev (>= 0.48),
                libsdl1.2-dev,
diff --git a/debian/rules b/debian/rules
index c20752735d..76f3c9b661 100755
--- a/debian/rules
+++ b/debian/rules
@@ -72,6 +72,7 @@ endif
 	    --enable-linux-io-uring \
 	    --enable-numa \
 	    --enable-opengl \
+	    --enable-png \
 	    --enable-rbd \
 	    --enable-seccomp \
 	    --enable-slirp \
-- 
2.47.3