Support query! for cargo-free systems (#2927)

Co-authored-by: kshramt <[email protected]>

Author: kshramt

sqlx-macros-core/src/query/mod.rs

@@ -166,13 +166,13 @@ pub fn expand_input<'a>(
 
             // Check SQLX_OFFLINE_DIR, then local .sqlx, then workspace .sqlx.
             let dirs = [
-                env("SQLX_OFFLINE_DIR").ok().map(PathBuf::from),
-                Some(METADATA.manifest_dir.join(".sqlx")),
-                Some(METADATA.workspace_root().join(".sqlx")),
+                || env("SQLX_OFFLINE_DIR").ok().map(PathBuf::from),
+                || Some(METADATA.manifest_dir.join(".sqlx")),
+                || Some(METADATA.workspace_root().join(".sqlx")),
             ];
             let Some(data_file_path) = dirs
                 .iter()
-                .filter_map(|path| path.as_ref())
+                .filter_map(|path| path())
                 .map(|path| path.join(&filename))
                 .find(|path| path.exists())
             else {