shared: move src/import/curl-util.h to src/shared/

Move more common definitions in the header file instead of repeating
them in bunch of places. src/import/curl-util.[ch] is renamed so that
it's shared more naturally with other components.

src/imds/imdsd.c

@@ -18,6 +18,7 @@
 #include "chase.h"
 #include "copy.h"
 #include "creds-util.h"
+#include "curl-util.h"
 #include "device-private.h"
 #include "dns-rr.h"
 #include "errno-util.h"
@@ -53,8 +54,6 @@
 #include "web-util.h"
 #include "xattr-util.h"
 
-#include "../import/curl-util.h"
-
 /* This implements a client to the AWS' and Azure's "Instance Metadata Service", as well as GCP's "VM
  * Metadata", i.e.:
  *

src/imds/meson.build

@@ -11,8 +11,8 @@ executables += [
                 'sources' : files(
                         'imdsd.c',
                         'imds-util.c'
-                ) + import_curl_util_c,
-                'dependencies' : [ libcurl ],
+                ) + curl_util_c,
+                'dependencies' : [libcurl],
         },
         libexec_template + {
                 'name' : 'systemd-imds',