pc-bios: ensure keymaps dependencies set vnc tests

I was seeing failures on vnc-display-test on FreeBSD:

  make vm-build-freebsd V=1 TARGET_LIST=aarch64-softmmu BUILD_TARGET=check-qtest QEMU_LOCAL=1 DEBUG=1

Leads to:

  qemu-system-aarch64: -vnc none: could not read keymap file: 'en-us'
  Broken pipe
  ../src/tests/qtest/libqtest.c:196: kill_qemu() tried to terminate QEMU process but encountered exit status 1 (expected 0)

which was as far as I could tell because we don't populate the
$BLD/pc-bios/keymaps (although scripts/symlink-install-tree.py
attempts to symlink qemu-bundle/usr/local/share/qemu/keymaps/ to that
dir).

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250108121054.1126164-31-alex.bennee@linaro.org>

pc-bios/keymaps/meson.build

@@ -39,19 +39,18 @@ else
   native_qemu_keymap = qemu_keymap
 endif
 
+keymap_targets = []
 if native_qemu_keymap.found()
-  t = []
   foreach km, args: keymaps
     # generate with qemu-kvm
-    t += custom_target(km,
-                       build_by_default: true,
-                       output: km,
-                       command: [native_qemu_keymap, '-f', '@OUTPUT@', args.split()],
-                       install: have_system,
-                       install_dir: qemu_datadir / 'keymaps')
+    keymap_targets += custom_target(km,
+                                    build_by_default: true,
+                                    output: km,
+                                    command: [native_qemu_keymap, '-f', '@OUTPUT@', args.split()],
+                                    install: have_system,
+                                    install_dir: qemu_datadir / 'keymaps')
   endforeach
-
-  alias_target('update-keymaps', t)
+  alias_target('update-keymaps', keymap_targets)
 else
   install_data(keymaps.keys(), install_dir: qemu_datadir / 'keymaps')
 endif

tests/qtest/meson.build

@@ -383,7 +383,7 @@ qtests = {
 if vnc.found()
   gvnc = dependency('gvnc-1.0', method: 'pkg-config', required: false)
   if gvnc.found()
-    qtests += {'vnc-display-test': [gvnc]}
+    qtests += {'vnc-display-test': [gvnc, keymap_targets]}
     qtests_generic += [ 'vnc-display-test' ]
   endif
 endif