fix MacOS sdl2 bug (#542)

Cargo.lock

@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "ab_glyph_rasterizer"
 version = "0.1.4"
@@ -2299,9 +2301,9 @@ dependencies = [
 
 [[package]]
 name = "sdl2-sys"
-version = "0.34.3"
+version = "0.34.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28d81feded049b9c14eceb4a4f6d596a98cebbd59abdba949c5552a015466d33"
+checksum = "4cb164f53dbcad111de976bbf1f3083d3fcdeda88da9cfa281c70822720ee3da"
 dependencies = [
  "cfg-if 0.1.10",
  "cmake",

Cargo.toml

@@ -57,10 +57,10 @@ winapi = { version = "0.3.9", features = ["winuser"] }
 
 [target.'cfg(windows)'.build-dependencies]
 winres = "0.1.11"
-sdl2-sys = { version = "0.34.3", default-features = false, features = ["bundled", "static-link"] }
+sdl2-sys = { version = "0.34.4", default-features = false, features = ["bundled", "static-link"] }
 
 [target.'cfg(macos)'.build-dependencies]
-sdl2-sys = { version = "0.34.3", default-features = false, features = ["bundled", "static-link"] }
+sdl2-sys = { version = "0.34.4", default-features = false, features = ["bundled", "static-link"] }
 
 [profile.release]
 debug = true