CI: get wxgtk2 via aur_pkgs as it was dropped from the official repos

Note: this does not actually fix the image builder. It just lets us get
far enough to see the testsuite error (the same docker bug that opensuse
has).

ci/ciimage/arch/install.sh

@@ -10,7 +10,7 @@ pkgs=(
   python python-pip
   ninja make git sudo fakeroot autoconf automake patch
   libelf gcc gcc-fortran gcc-objc vala rust bison flex cython go dlang-dmd
-  mono boost qt5-base gtkmm3 gtest gmock protobuf wxgtk2 gobject-introspection
+  mono boost qt5-base gtkmm3 gtest gmock protobuf gobject-introspection
   itstool gtk3 java-environment=8 gtk-doc llvm clang sdl2 graphviz
   doxygen vulkan-validation-layers openssh mercurial gtk-sharp-2 qt5-tools
   libwmf valgrind cmake netcdf-fortran openmpi nasm gnustep-base gettext
@@ -18,7 +18,7 @@ pkgs=(
   # cuda
 )
 
-aur_pkgs=(scalapack)
+aur_pkgs=(scalapack wxwidgets-gtk2)
 cleanup_pkgs=(go)
 
 AUR_USER=docker