cgdb: add depends_on('gdb', type='run') (#27753)

* Added gdb Dependency

When using spack to install cgdb, a spack-built gdb is necessary to
avoid dynamic link errors.

- Added maintainer: tuxfan
- Set preferred to 'master' (best version for spack currently)

* Update: The gdb dependency added by this PR is for runtime

Co-authored-by: Bernhard Kaindl <43588962+bernhardkaindl@users.noreply.github.com>

var/spack/repos/builtin/packages/cgdb/package.py

@@ -9,15 +9,17 @@
 class Cgdb(AutotoolsPackage):
     """A curses front-end to GDB"""
 
+    maintainers = ['tuxfan']
     homepage = 'https://cgdb.github.io'
     url      = 'https://cgdb.me/files/cgdb-0.7.1.tar.gz'
     git      = 'https://github.com/cgdb/cgdb.git'
 
-    version('master', branch='master', submodule=False, preferred=False)
+    version('master', branch='master', submodule=False, preferred=True)
     version('0.7.1', sha256='bb723be58ec68cb59a598b8e24a31d10ef31e0e9c277a4de07b2f457fe7de198')
     version('0.7.0', sha256='bf7a9264668db3f9342591b08b2cc3bbb08e235ba2372877b4650b70c6fb5423')
 
     # Required dependency
+    depends_on('gdb', type='run')
     depends_on('ncurses')
     depends_on('readline')
     depends_on('autoconf', type='build', when='@master')