support linking with system libunibreak

meson_options.txt

@@ -388,3 +388,9 @@ option('docs',
   value: false,
   description: 'Enable building C of documentation (Requires doxygen)'
 )
+
+option('embedded-libunibreak',
+  type : 'boolean',
+  value : true,
+  description : 'Use the embedded in-tree libunibreak instead of the system libunibreak.'
+)

src/static_libs/libunibreak/meson.build

@@ -1,4 +1,4 @@
-
+if (get_option('embedded-libunibreak'))
   libunibreak_src = [
     'unibreakbase.h',
     'unibreakdef.h',
@@ -30,3 +30,6 @@ libunibreak = declare_dependency(
     link_with: libunibreak_lib,
     dependencies: [eina],
   )
+else
+  libunibreak = dependency('libunibreak', version : '>=4.2')
+endif