c-dvar: add external dependency

Add the c-dvar dbus variant parser as an external library dependency,
and drop the internal version.

Signed-off-by: Tom Gundersen <teg@jklm.no>

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "subprojects/c-list"]
 	path = subprojects/c-list
 	url = https://github.com/c-util/c-list.git
+[submodule "subprojects/c-dvar"]
+	path = subprojects/c-dvar
+	url = https://github.com/c-util/c-dvar.git

meson.build

@@ -6,10 +6,11 @@ project('dbus-broker',
 
 add_project_arguments('-D_GNU_SOURCE', language: 'c')
 mod_pkgconfig = import('pkgconfig')
-dep_csundry = dependency('libcsundry', version: '>=1', fallback: [ 'c-sundry', 'libcsundry_dep' ])
+dep_cdvar = dependency('libcdvar', version: '>=1', fallback: [ 'c-dvar', 'libcdvar_dep' ])
 dep_clist = dependency('libclist', version: '>=1', fallback: [ 'c-list', 'libclist_dep' ])
 dep_crbtree = dependency('libcrbtree', version: '>=2', fallback: [ 'c-rbtree', 'libcrbtree_dep' ])
-dep_thread = dependency('threads')
+dep_csundry = dependency('libcsundry', version: '>=1', fallback: [ 'c-sundry', 'libcsundry_dep' ])
 dep_systemd = dependency('libsystemd', version: '>=230')
+dep_thread = dependency('threads')
 
 subdir('src')