Move basic/kbd-util to shared/

It is (or should be used) in localectl, localed, and a few other places,
no reason to keep it in basic/.

src/basic/meson.build

@@ -83,8 +83,6 @@ basic_sources = files('''
         io-util.c
         io-util.h
         ioprio.h
-        kbd-util.c
-        kbd-util.h
         khash.c
         khash.h
         label.c

src/shared/kbd-util.c

@@ -89,7 +89,6 @@ int get_keymaps(char ***ret) {
 }
 
 bool keymap_is_valid(const char *name) {
-
         if (isempty(name))
                 return false;
 

src/shared/meson.build

@@ -149,6 +149,8 @@ shared_sources = files('''
         json-internal.h
         json.c
         json.h
+        kbd-util.c
+        kbd-util.h
         killall.c
         killall.h
         libcrypt-util.c