[gimp] configure: make clearer the test for native GEGL executable.

[Jehan Pagès <jehanp src gnome org>]

commit 65ba879c6563b33a1758abc1948f288bf46a46cb
Author: Jehan <jehan girinstud io>
Date:   Fri Mar 9 17:39:23 2018 +0100

    configure: make clearer the test for native GEGL executable.
    
    If running for instance in a cross-compilation, I need to make clearer
    the fact we are looking for a native GEGL and also that we are looking
    for the executable (used during the build), not the library. This is a
    different test as the one for the library with PKG_CHECK_MODULES (which
    looks for the target platform's library).

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b23171a..37a72b9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -742,7 +742,7 @@ AC_MSG_RESULT($have_glib_2_43)
 
 AC_PATH_PROG(GEGL, gegl, no)
 if test "x$GEGL" = xno; then
-  add_deps_error([gegl], [Could not find gegl in your PATH.])
+  add_deps_error([gegl], [Could not find native gegl executable in your PATH.])
 fi