Simplify the specification of include dirs in the build dir

In build.info files, make the include directory in the build directory
absolute, or Configure will think it should be added to the source
directory top.  Configure will turn it into a relative path if
possible.

Reviewed-by: Rich Salz <rsalz@openssl.org>

apps/build.info

@@ -1,4 +1,4 @@
-{- use File::Spec::Functions qw/catdir abs2rel/; -}
+{- use File::Spec::Functions qw/catdir rel2abs/; -}
 PROGRAMS=openssl
 SOURCE[openssl]=\
         openssl.c \
@@ -10,7 +10,7 @@ SOURCE[openssl]=\
         srp.c ts.c verify.c version.c x509.c rehash.c \
         apps.c opt.c s_cb.c s_socket.c \
         app_rand.c
-INCLUDE[openssl]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} .. ../include
+INCLUDE[openssl]={- rel2abs(catdir($builddir,"../include")) -} .. ../include
 DEPEND[openssl]=../libssl
 
 SCRIPTS=CA.pl