libbej: Export the package for other repo to use

Make the library non-static so that other repo can be linked to
it. Also install the headers for libbej.

Change-Id: I89dba36859b569283b61d3ac448f23289c21944a
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/include/meson.build b/include/meson.build
new file mode 100644
index 0000000..ff3f19a
--- /dev/null
+++ b/include/meson.build
@@ -0,0 +1 @@
+install_subdir('.', install_dir: get_option('includedir'))