[gegl] configure: remove some obsolete autoconf variables.

[Jehan Pagès <jehanp src gnome org>]

commit 6a96ca56dca372616c91e29881bb142351864b6f
Author: Jehan <jehan girinstud io>
Date:   Tue May 8 00:38:31 2018 +0200

    configure: remove some obsolete autoconf variables.
    
    Not sure when these OPENRAW_(LIBS|CFLAGS) date from, but these are not
    referencing any useful value anymore, neither is this used in any way.

 configure.ac |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b63b802..db3ade9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -919,10 +919,6 @@ AC_SUBST(SDL_CFLAGS)
 AC_SUBST(SDL_LIBS)
 
 
-AC_SUBST(OPENRAW_CFLAGS) 
-AC_SUBST(OPENRAW_LIBS) 
-
-
 ##################
 # Check for libraw
 ##################