gnu: guile-fibers-1.1: Resurrect cross-build.

The cross-build fix patch for guile-fibers-1.3.1 does not apply to
guile-fibers-1.1.

This is a follow-up to commit
    20c7b8dd04
    gnu: guile-fibers: Fix cross-build to the Hurd.

* gnu/packages/guile-xyz.scm (guile-fibers-1.1)[arguments]: When
cross-building, remove stage "apply-cross-build-fix-patch".

Change-Id: I030264e79709bb6b9753461a998ce629a37e4c01

gnu/packages/guile-xyz.scm

@@ -937,6 +937,13 @@ is not available for Guile 2.0.")
            guile-3.0            ;for 'guild compile
            ;; Gettext brings 'AC_LIB_LINKFLAGS_FROM_LIBS'
            gettext-minimal))
+    (arguments
+     (if (%current-target-system)
+         (substitute-keyword-arguments (package-arguments guile-fibers)
+           ((#:phases phases)
+            #~(modify-phases #$phases
+                (delete 'apply-cross-build-fix-patch))))
+         (package-arguments guile-fibers)))
     (inputs
      (list guile-3.0))                            ;for libguile-3.0.so
     (supported-systems