vendor/miniaudio: fix import for macos

Using `system:miniaudio` is suboptimal, we already provide the
`Makefile` that builds the `lib/miniaudio.a` and this works on MacOS.
This PR makes linking with that library the default.

vendor/miniaudio/decoding.odin

@@ -4,10 +4,8 @@ import "core:c"
 
 when ODIN_OS == .Windows {
 	foreign import lib "lib/miniaudio.lib"
-} else when ODIN_OS == .Linux {
-	foreign import lib "lib/miniaudio.a"
 } else {
-	foreign import lib "system:miniaudio"
+	foreign import lib "lib/miniaudio.a"
 }
 
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