gnu: guile-static: Switch to gexps.

* gnu/packages/make-bootstrap.scm (make-guile-static): Switch to gexps.

gnu/packages/make-bootstrap.scm

@@ -613,24 +613,24 @@ for `sh' in $PATH, and without nscd, and with static NSS modules."
          (replace "libgc" libgc/static-libs)))
       (arguments
        (substitute-keyword-arguments (package-arguments guile)
-         ((#:configure-flags flags '())
+         ((#:configure-flags flags #~'())
           ;; When `configure' checks for ltdl availability, it
           ;; doesn't try to link using libtool, and thus fails
           ;; because of a missing -ldl.  Work around that.
-          `(list "LDFLAGS=-ldl" "--enable-mini-gmp"
+          #~(list "LDFLAGS=-ldl" "--enable-mini-gmp"
 
                   ;; Guile does an LTO build by default, but in 3.0.9 it
                   ;; wrongfully picks 'ar' instead of 'gcc-ar', so work around
                   ;; it (see <https://issues.guix.gnu.org/61086>).
-                 ,@(if (version-prefix? "3.0" (package-version guile))
-                       '("AR=gcc-ar" "RANLIB=gcc-ranlib")
-                       '())
+                  #$@(if (version-prefix? "3.0" (package-version guile))
+                         #~("AR=gcc-ar" "RANLIB=gcc-ranlib")
+                         #~())
 
-                 ,@(if (hurd-target?)
-                       '("--disable-jit")
-                       '())))
+                  #$@(if (hurd-target?)
+                         #~("--disable-jit")
+                         #~())))
          ((#:phases phases '%standard-phases)
-          `(modify-phases ,phases
+          #~(modify-phases #$phases
 
               ;; Do not record the absolute file name of 'sh' in
               ;; (ice-9 popen).  This makes 'open-pipe' unusable in