[PR PATCH] qemu: fix typo resulting in broken build when disabling Jack

[ScrelliCopter <ScrelliCopter@users.noreply.github.com>]

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There is a new pull request by ScrelliCopter against master on the void-packages repository

https://github.com/ScrelliCopter/void-packages qemu-jack
https://github.com/void-linux/void-packages/pull/33906

qemu: fix typo resulting in broken build when disabling Jack
Oops 🥴
addresses part of #33728

#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [x] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR


A patch file from https://github.com/void-linux/void-packages/pull/33906.patch is attached

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From e99781e6c1510816751e3a6b98061bfa1ab4c5c2 Mon Sep 17 00:00:00 2001
From: a dinosaur <nick@a-dinosaur.com>
Date: Fri, 5 Nov 2021 05:45:22 +1100
Subject: [PATCH] qemu: fix typo resulting in broken build when disabling Jack

---
 srcpkgs/qemu/template | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/srcpkgs/qemu/template b/srcpkgs/qemu/template
index cbb6bd8b89d2..cb21578cfed2 100644
--- a/srcpkgs/qemu/template
+++ b/srcpkgs/qemu/template
@@ -69,7 +69,7 @@ do_configure() {
 		want_sdl="--enable-sdl"
 		audio_sdl=",sdl"
 	fi
-	if [ $"build_option_jack" ]; then
+	if [ "$build_option_jack" ]; then
 		audio_jack=",jack"
 	fi