basic/unit-file: move to shared/

Preparation for later commits, where path-lookup would be
moved into libsystemd.

Note that it currently includes sd-id128.h, hence shared/
seems more appropriate anyway.

src/basic/meson.build

@@ -106,7 +106,6 @@ basic_sources = files(
         'uid-classification.c',
         'uid-range.c',
         'unit-def.c',
-        'unit-file.c',
         'unit-name.c',
         'user-util.c',
         'utf8.c',

src/shared/meson.build

@@ -170,6 +170,7 @@ shared_sources = files(
         'tpm2-util.c',
         'tpm2-event-log.c',
         'udev-util.c',
+        'unit-file.c',
         'user-record-nss.c',
         'user-record-show.c',
         'user-record.c',