[Tools][GTK][WPE] Add missing 'mesa-common-dev' dependency

https://bugs.webkit.org/show_bug.cgi?id=260496

Reviewed by Carlos Alberto Lopez Perez.

267186@main requires dri.pkg but this file is only available if
'mesa-common-dev' is installed.

Besides, Debian 12 reported a runtime error because the file
'dri.pkg' no longer defines the variable 'libdir'. In case 'libdir' doesn't
exist, set 'libdir' to the parent dir of 'dridriverdir' fixes the issue.

* Tools/Scripts/generate-bundle:
* Tools/glib/dependencies/apt:

Canonical link: https://commits.webkit.org/267404@main

Tools/Scripts/generate-bundle

@@ -484,7 +484,11 @@ class BundleCreator(object):
     def _get_mesa_libraries(self):
         mesa_library_names = ['libglapi', 'libEGL', 'libGL', 'libGLESv2', 'libGLX', 'libdrm', 'libgbm', 'libMesaOpenCL']
         mesa_libraries = []
-        lib_dir_dri = self._get_pkg_config_var('dri', 'libdir')
+        try:
+            lib_dir_dri = self._get_pkg_config_var('dri', 'libdir')
+        except RuntimeError:
+            lib_dir_dri = os.path.dirname(self._get_pkg_config_var('dri', 'dridriverdir'))
+
         # Some versions of the flatpak SDK ship the Mesa libraries into a non-standard path.
         candidate_lib_dirs = [ lib_dir_dri, os.path.join(lib_dir_dri, 'GL/default/lib') ]
         for lib_dir in candidate_lib_dirs:

Tools/glib/dependencies/apt

@@ -70,6 +70,7 @@ PACKAGES=(
     $(aptIfExists libwpebackend-fdo-1.0-dev)
     libxml2-utils
     libxslt1-dev
+    mesa-common-dev
     ninja-build
     patch
     ruby