Rename includedir to $prefix/include/dvdread to remain API-compatible

with old upstream.

configure2

@@ -96,7 +96,7 @@ PREFIX=`cd $PREFIX && pwd`
 
 test -z "$libdir" && libdir=$PREFIX/lib
 test -z "$shlibdir" && shlibdir=$PREFIX/lib
-test -z "$incdir" && dvdread_incdir=$PREFIX/include/libdvdread
+test -z "$incdir" && dvdread_incdir=$PREFIX/include/dvdread
 
 targetos=`uname -s`
 case $targetos in

src/Makefile.am

 include $(top_srcdir)/misc/Makefile.common
 
-includedir = ${prefix}/include/libdvdread
+includedir = ${prefix}/include/dvdread
 
 AM_CPPFLAGS = -I$(top_srcdir)/src