Implement automatic loading of directory buildfiles

Now instead of explicitly writing:

d = foo/ bar/
./: $d
include $d

We can (usually) just write:

./: foo/ bar/

1 files changed, 1 insertions, 5 deletions

diff --git a/buildfile b/buildfile
index 54cd0ff..8f52e29 100644
--- a/buildfile
+++ b/buildfile
@@ -2,15 +2,11 @@
 # copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
 # license   : MIT; see accompanying LICENSE file
 
-d = build2/ tests/ unit-tests/ doc/
-
-./: $d \
+./: build2/ tests/ unit-tests/ doc/ \
 doc{INSTALL LICENSE NEWS README version} \
 file{bootstrap.sh bootstrap-msvc.bat bootstrap-mingw.bat} \
 file{INSTALL.cli config.guess config.sub manifest}
 
-include $d
-
 # Don't install tests or the INSTALL file.
 #
 dir{tests/}:      install = false