[gegl] configure: remove dependency on exiv2

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 4ec860afbb51f71305bf8169a39a9be4e781440c
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Mar 12 22:00:02 2019 +0100

    configure: remove dependency on exiv2

 configure.ac | 20 --------------------
 1 file changed, 20 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 467e4b82d..69c831a5c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,7 +40,6 @@ m4_define([gimp_full_name], [Generic Graphical Library])
 # required versions of external libraries
 m4_define([babl_required_version], [0.1.62])
 m4_define([cairo_required_version], [1.12.2])
-m4_define([exiv2_required_version], [0.25])
 m4_define([gdk_pixbuf_required_version], [2.32.0])
 m4_define([introspection_required_version], [1.32.0])
 m4_define([glib_required_version], [2.44.0])
@@ -1162,25 +1161,6 @@ AM_CONDITIONAL(HAVE_SPIRO, test "$spiro_ok" = "yes")
 
 AC_SUBST(LIBSPIRO)
 
-###################
-# Check for exiv2
-###################
-
-AC_ARG_WITH(exiv2, [  --without-exiv2         build without libexiv2 support])
-
-have_exiv2="no"
-if test "x$with_exiv2" != "xno"; then
-  PKG_CHECK_MODULES(EXIV2, exiv2 >= exiv2_required_version,
-    have_exiv2="yes",
-    have_exiv2="no  (exiv2 library not found)")
-fi
-
-AM_CONDITIONAL(HAVE_EXIV2, test "$have_exiv2" = "yes")
-
-AC_SUBST(EXIV2_CFLAGS)
-AC_SUBST(EXIV2_CXXFLAGS)
-AC_SUBST(EXIV2_LIBS)
-
 ###################
 # Check for UMFPACK
 ###################