man: fix prefixes for weston.ini(5)

Replace a few hardcoded paths with the substitutes

https://gitlab.freedesktop.org/wayland/weston/issues/105

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

man/weston.ini.man

@@ -124,7 +124,7 @@ directory are:
 .TP 7
 .BI "backend=" headless-backend.so
 overrides defaults backend. Available backend modules in the
-.IR "__weston_modules_dir__"
+.IR "__libweston_modules_dir__"
 directory are:
 .PP
 .RS 10
@@ -477,7 +477,7 @@ present. This seat can be constrained like any other.
 .RE
 .SH "INPUT-METHOD SECTION"
 .TP 7
-.BI "path=" "/usr/libexec/weston-keyboard"
+.BI "path=" "__weston_libexecdir__/weston-keyboard"
 sets the path of the on screen keyboard input method (string).
 .RE
 .RE
@@ -560,13 +560,13 @@ The terminal shell (string). Sets the $TERM variable.
 .RE
 .SH "XWAYLAND SECTION"
 .TP 7
-.BI "path=" "/usr/bin/Xwayland"
+.BI "path=" "__xserver_path__"
 sets the path to the xserver to run (string).
 .RE
 .RE
 .SH "SCREEN-SHARE SECTION"
 .TP 7
-.BI "command=" "/usr/bin/weston --backend=rdp-backend.so \
+.BI "command=" "__weston_bindir__/weston --backend=rdp-backend.so \
 --shell=fullscreen-shell.so --no-clients-resize"
 sets the command to start a fullscreen-shell server for screen sharing (string).
 .RE