ghidra: add tmp/ to builddir

sakamoto/ghidra/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Patrycja Rosa <alpine@ptrcnull.me>
 pkgname=ghidra
 pkgver=9.2
-pkgrel=0
+pkgrel=1
 pkgdesc="Software reverse engineering (SRE) framework"
 url="https://ghidra-sre.org/"
 arch="x86_64"
@@ -13,7 +13,7 @@ install=""
 subpackages=""
 _filename="${pkgname}-${pkgver}_1.x86_64-musl.xbps"
 source="https://alpha.de.repo.voidlinux.org/current/musl/$_filename"
-builddir="$srcdir/"
+builddir="$srcdir/tmp"
 
 build() {
 	zstd -d $(realpath $_filename) -o package.tar