build: Avoid MaybeUninit on older Debian

Cargo.toml.in

@@ -19,6 +19,7 @@ path = "@path@/examples/test_layout.rs"
 [features]
 gio_v0_5 = []
 gtk_v0_5 = []
+rustc_less_1_36 = []
 
 # Dependencies which don't change based on build flags
 [dependencies.cairo-sys-rs]

meson.build

@@ -83,7 +83,7 @@ cargo_toml_base = configure_file(
 cargo_deps = files('Cargo.deps')
 
 if get_option('legacy') == true
-    cargo_build_flags += ['--features', 'gtk_v0_5,gio_v0_5']
+    cargo_build_flags += ['--features', 'gtk_v0_5,gio_v0_5,rustc_less_1_36']
     cargo_deps = files('Cargo.deps.legacy')
 endif
     

src/keyboard.rs

@@ -143,7 +143,11 @@ fn single_key_map_new() -> SingleKeyMap {
     unsafe {
         // Inspired by
         // https://www.reddit.com/r/rust/comments/5n7bh1/how_to_create_an_array_of_a_type_with_clone_but/
+        #[cfg(feature = "rustc_less_1_36")]
+        let mut array: SingleKeyMap = mem::uninitialized();
+        #[cfg(not(feature = "rustc_less_1_36"))]
         let mut array: SingleKeyMap = mem::MaybeUninit::uninit().assume_init();
+
         for element in array.iter_mut() {
             ptr::write(element, None);
         }