Make it possible for %install to specify %_javadir as destination
Lubomir Kundrak <lkundrak@redhat.com>

diff -urp subversion-1.4.6.orig/Makefile.in subversion-1.4.6/Makefile.in
--- subversion-1.4.6.orig/Makefile.in	2008-02-21 11:05:31.000000000 +0100
+++ subversion-1.4.6/Makefile.in	2008-02-21 11:05:15.000000000 +0100
@@ -71,9 +71,9 @@ swig_pydir_extra = @libdir@/svn-python/s
 swig_pldir = @libdir@/svn-perl
 swig_rbdir = $(SWIG_RB_SITE_ARCH_DIR)/svn/ext
 
-javahl_javadir = @libdir@/svn-javahl
-javahl_javahdir = @libdir@/svn-javahl/include
-javahl_libdir = @libdir@
+javahl_javadir ?= @libdir@/svn-javahl
+javahl_javahdir ?= @libdir@/svn-javahl/include
+javahl_libdir ?= @libdir@
 
 MSGFMT = @MSGFMT@
 MSGFMTFLAGS = @MSGFMTFLAGS@