libweston: export weston_config API

Make it official that libweston will export the weston_config API, as requested
in https://gitlab.freedesktop.org/wayland/weston/merge_requests/29 .

There is no other way third party helper clients could access the API.

The autotools build has been accidentally exporting it all the time, but the
Meson build needed fixing.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

README.md

@@ -88,6 +88,13 @@ Libweston was first introduced in Weston 1.12, and is expected to
 continue evolving through many Weston releases before it achieves a
 stable API and feature completeness.
 
+Libweston's primary purpose is exporting an API for creating Wayland
+compositors. Libweston's secondary purpose is to export the weston_config API
+so that third party plugins and helper programs can read `weston.ini` if they
+want to. However, these two scopes are orthogonal and independent. At no point
+will the compositor functionality use or depend on the weston_config
+functionality.
+
 
 API/ABI (in)stability and parallel installability
 -------------------------------------------------

ivi-shell/meson.build

@@ -30,7 +30,7 @@ if get_option('shell-ivi')
 		'hmi-controller',
 		srcs_ivi_hmi,
 		include_directories: include_directories('..', '../shared'),
-		dependencies: dep_libweston,
+		dependencies: [ dep_libweston, dep_libshared ],
 		name_prefix: '',
 		install: true,
 		install_dir: dir_module_weston

libweston/meson.build

@@ -4,7 +4,6 @@ deps_libweston = [
 	dep_libm,
 	dep_libdl,
 	dep_libdrm_headers,
-	dep_libshared,
 	dep_xkbcommon,
 ]
 srcs_libweston = [
@@ -75,6 +74,7 @@ lib_weston = shared_library(
 	link_args: [ '-export-dynamic' ],
 	install: true,
 	version: '0.0.@0@'.format(libweston_revision),
+	link_whole: lib_libshared,
 	dependencies: deps_libweston
 )
 

shared/meson.build

@@ -12,6 +12,7 @@ lib_libshared = static_library(
 	srcs_libshared,
 	include_directories: include_directories('..'),
 	dependencies: deps_libshared,
+	pic: true,
 	install: false
 )
 dep_libshared = declare_dependency(