ci: move gdb to control build-deps so package-arch tests get it too

gdb was only added to .github/scripts/install-deps.sh, which runs on
the Ubuntu rip-and-test jobs. The package-arch jobs build and test in
debian containers and install build deps via apt-get build-dep, so they
never got gdb and the ui-smoke crash dump path had none when a GUI
cored there (hdiethelm, PR LinuxCNC#4136 review).

Move gdb to debian/control.top.in under <!nocheck>, next to the other
test-only deps (xvfb, x11-utils, imagemagick). build-dep installs it for
both the rip jobs and the package-arch jobs, so the explicit entry in
install-deps.sh is now redundant and dropped.

Author: grandixximo

.github/scripts/install-deps.sh

@@ -4,6 +4,6 @@ set -eu #Needed so CI fails when anything is wrong
 set -x
 
 sudo apt-get --quiet update
-sudo apt-get install --yes --no-install-recommends devscripts equivs build-essential lintian clang gdb
+sudo apt-get install --yes --no-install-recommends devscripts equivs build-essential lintian clang
 debian/configure
 sudo apt-get --yes build-dep .

debian/control.top.in

@@ -49,6 +49,7 @@ Build-Depends:
     xvfb <!nocheck>,
     x11-xserver-utils <!nocheck>,
     x11-utils <!nocheck>,
+    gdb <!nocheck>,
     imagemagick <!nocheck>,
     python3-opengl <!nocheck>,
     python3-pyqt5 <!nocheck>,