[gimp] configure: fix typo s/PostPcript/PostScript/.

[Jehan Pagès <jehanp src gnome org>]

commit 0319b49fbf36d3ee992af377c66504501c7f69ba
Author: Jehan <jehan girinstud io>
Date:   Sun Jan 29 01:05:32 2017 +0100

    configure: fix typo s/PostPcript/PostScript/.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b817961..524cb54 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1422,7 +1422,7 @@ if test "x$with_gs" != xno; then
   if test "x$have_gs" != xyes -a "x$with_gs" = xyes; then
     AC_MSG_ERROR([
 *** Checks for Ghostscript library failed. You can build without it by passing
-*** --without-gs to configure but you won't be able to use PostPcript files then.])
+*** --without-gs to configure but you won't be able to use PostScript files then.])
   fi
 fi