test: fix build error in t/xml.c

38a1a9b broke `t/xml.c` due to `macros.h` requiring `wlr/version.h`.
This commit fixes it by adding `wlroots` as a direct dependency of the
test executables.

t/meson.build

@@ -1,3 +1,10 @@
+test_deps = [
+  dep_cmocka,
+  glib,
+  xml2,
+  wlroots,
+]
+
 test_lib = static_library(
   'test_lib',
   sources: files(
@@ -8,12 +15,7 @@ test_lib = static_library(
     '../src/common/parse-bool.c',
   ),
   include_directories: [labwc_inc],
-  dependencies: [
-		dep_cmocka,
-		glib,
-		xml2,
-		wlroots,
-	],
+  dependencies: test_deps,
 )
 
 tests = [
@@ -30,7 +32,7 @@ foreach t : tests
       sources: '@0@.c'.format(t),
       include_directories: [labwc_inc],
       link_with: [test_lib],
-			dependencies: [xml2],
+      dependencies: test_deps,
     ),
     is_parallel: false,
   )