Revert "Don't rely on ENOSPC - relies on errno.h"

This reverts commit f6c2e4d292.

tasks/task_patch.c

@@ -710,6 +710,10 @@ static enum patch_error xdelta_apply_patch(
    {
       case 0: /* Success */
          break;
+      case ENOSPC:
+         error_patch = PATCH_TARGET_ALLOC_FAILED;
+         free(*targetdata);
+         goto cleanup_stream;
       default:
          error_patch = PATCH_UNKNOWN;
          free(*targetdata);