Meson: try to find udis86 through pkgconfig, fallback to subproject

Only the fork provides a .pc file, so there's no risk of linking the wrong
lib version. If pkg-config can't find it (most cases), fall back to using
the subproject through the wrap file.

src/meson.build

@@ -31,7 +31,11 @@ executable(
     backtrace_dep,
     epoll_dep,
     gio_dep,
-    udis86,
+
+    # Try to find canihavesomecoffee's udis86 using pkgconfig
+    # vmt/udis86 does not provide a .pc file and won't be detected this way
+    # Falls back to using the subproject through udis86.wrap
+    dependency('udis86'),
 
     dependency('pixman-1'),
     dependency('gl', 'opengl'),