gnu: commencement: Remove unneeded configure flag for bootstrap gettext.

* gnu/packages/commencement.scm (gettext-boot0): Remove unneeded
  --disable-threads.

gnu/packages/commencement.scm

@@ -421,14 +421,13 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
 
 (define gettext-boot0
   ;; A minimal gettext used during bootstrap.
-  (let ((gettext-minimal (package
-                           (inherit gnu-gettext)
+  (let ((gettext-minimal
+         (package (inherit gnu-gettext)
            (name "gettext-boot0")
            (inputs '())                           ;zero dependencies
            (arguments
             (substitute-keyword-arguments
-                                `(#:configure-flags '("--disable-threads")
-                                  #:tests? #f
+                `(#:tests? #f
                   ,@(package-arguments gnu-gettext))
               ((#:phases phases)
                `(modify-phases ,phases
@@ -437,8 +436,7 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
                              (lambda _
                                (chdir "gettext-tools")))
 
-                                  ;; Some test programs require pthreads,
-                                  ;; which we don't have.
+                  ;; Some test programs require pthreads, which we don't have.
                   (add-before 'configure 'no-test-programs
                               (lambda _
                                 (substitute* "tests/Makefile.in"