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

@@ -1,5 +1,5 @@
-
-libunibreak_src = [
+if (get_option('embedded-libunibreak'))
+  libunibreak_src = [
     'unibreakbase.h',
     'unibreakdef.h',
     'linebreak.h',
@@ -17,16 +17,19 @@ libunibreak_src = [
     'graphemebreakdef.h',
     'emojidef.h',
     'emojidef.c',
-]
+  ]
 
-libunibreak_lib = static_library('libunibreak',
+  libunibreak_lib = static_library('libunibreak',
       libunibreak_src,
       include_directories : config_dir,
       install: false,
-)
+  )
 
-libunibreak = declare_dependency(
+  libunibreak = declare_dependency(
     include_directories: [include_directories('.')],
     link_with: libunibreak_lib,
     dependencies: [eina],
-)
+  )
+else
+  libunibreak = dependency('libunibreak', version : '>=4.2')
+endif