skypeforlinux: update to 8.12.76.7

skypeforlinux/PKGBUILD

 pkgname=skypeforlinux
-pkgver=8.10.76.7
+pkgver=8.12.76.7
 pkgrel=1
 pkgdesc="Skype for Linux WebRTC Beta"
 arch=('x86_64')
@@ -10,11 +10,9 @@ optdepends=('gnome-keyring') # to be verified, how to replace it with kwallet?
 conflicts=('skype')
 provides=('skype')
 source=("https://repo.skype.com/deb/pool/main/s/skypeforlinux/skypeforlinux_${pkgver}_amd64.deb")
-sha256sums=('182cc956408b55f2487426af84b8cc32ad96ee982acf45391ff4514d1fcb00da')
+sha256sums=('a92e72c9ceee16c54a2c0899f6280dbe2aa8f525b1b32adb4ca19dce8a0f7b8a')
 
 package() {
-  cd "${srcdir}"
-  
   tar -xJC "${pkgdir}" -f data.tar.xz
   install -d "${pkgdir}/usr/share/licenses/skypeforlinux"
   mv "${pkgdir}/usr/share/skypeforlinux/LICENSES.chromium.html" "${pkgdir}/usr/share/licenses/skypeforlinux/"