protocol/meson.build: search path for wayland-scanner if not found using pkg-config

This should improve cross compilation reliability.

protocol/meson.build

 dep_scanner = dependency('wayland-scanner', native: true)
-prog_scanner = find_program(dep_scanner.get_pkgconfig_variable('wayland_scanner'))
+if meson.is_cross_build()
+	prog_scanner = find_program('wayland-scanner', dep_scanner.get_pkgconfig_variable('wayland_scanner'))
+else
+	prog_scanner = find_program(dep_scanner.get_pkgconfig_variable('wayland_scanner'))
+endif
+
 
 # XXX: For minor version 2 of zwp_linux_explicit_synchronization_v1, we
 # actually need a development version after 1.17, but there is no way to

[Pekka Paalanen]

I guess this line needs to move into the else-branch as well.

[Pekka Paalanen]

Or should, if we didn't use dep_scanner to check the version. sigh

[Pekka Paalanen]

The version check would have to be changed to rely on wayland-scanner -v output instead of wayland-scanner.pc. That works for both cases.

[James Hilliard]

Hmm, so should I leave this as is for now?

[Pekka Paalanen]

It would not be quite right to leave it as is if we find the scanner by any other means than from the .pc file.