Add support for target visibility, use for dist, test, install

This means we can no longer write:

install = false

Now it should be:

*: install = false

1 files changed, 4 insertions, 1 deletions

diff --git a/buildfile b/buildfile
index 7e6d682..45bcdcc 100644
--- a/buildfile
+++ b/buildfile
@@ -11,4 +11,7 @@ file{INSTALL.cli config.guess config.sub manifest}
 
 include $d
 
-doc{INSTALL*}: install = false
+# Don't install tests or the INSTALL file.
+#
+dir{tests/}: install = false
+doc{INSTALL}@./: install = false