man: add man page for weston

It is not complete, but has lots of stuff already.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
diff --git a/configure.ac b/configure.ac
index efdd6b4..aa2caf5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -14,6 +14,7 @@
 # Check for programs
 AC_PROG_CC
 AC_PROG_CXX
+AC_PROG_SED
 
 # Initialize libtool
 LT_PREREQ([2.2])
@@ -240,5 +241,6 @@
 		 wcap/Makefile
 		 data/Makefile
 		 protocol/Makefile
+		 man/Makefile
 		 tests/Makefile])
 AC_OUTPUT