bug#26805: [PATCH] gs-fonts: add missing podule imports

[Sergei Trofimovich <slyfox@inbox.ru>]

On code-updates branch 'gs-fonts' build fails as:

ice-9/psyntax.scm:1534:32: In procedure expand-macro:
ice-9/psyntax.scm:1534:32: Syntax error:
...-gs-fonts-8.11-guile-builder:1:2300: source expression failed to match
any pattern in form (%modify-phases phases* (delete (quote configure)))
builder for `/gnu/store/...-gs-fonts-8.11.drv' failed with exit code 1

* gnu/packages/ghostscript.scm (gs-fonts): add missing modules to
  %modify-phases call: gnu-build-system, utils, srfi-1

Signed-off-by: Sergei Trofimovich <slyfox@inbox.ru>
---
 gnu/packages/ghostscript.scm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gnu/packages/ghostscript.scm b/gnu/packages/ghostscript.scm
index 076046e72..33b8f51b6 100644
--- a/gnu/packages/ghostscript.scm
+++ b/gnu/packages/ghostscript.scm
@@ -273,6 +273,10 @@ architecture.")
    (build-system gnu-build-system)
    (arguments
     `(#:tests? #f ; nothing to check, just files to copy
+
+      #:modules ((guix build gnu-build-system)
+                 (guix build utils)
+                 (srfi srfi-1))
       #:phases
       (modify-phases %standard-phases
         (delete 'configure)
-- 
2.12.2