firefox: update to 81.0.

[ci skip]

srcpkgs/firefox/patches/rust-glslopt.patch

@@ -1,13 +0,0 @@
-overwrite HOST_* flags to get rid of -MF
-
---- third_party/rust/glslopt/build.rs	2020-06-03 01:37:31.000000000 +0200
-+++ third_party/rust/glslopt/build.rs	2020-06-04 10:57:16.418469546 +0200
-@@ -28,6 +28,8 @@
-     env::remove_var(format!("CXXFLAGS_{}", &target));
-     env::remove_var(format!("CFLAGS_{}", target.replace("-", "_")));
-     env::remove_var(format!("CXXFLAGS_{}", target.replace("-", "_")));
-+    env::set_var("HOST_CFLAGS", "-O2");
-+    env::set_var("HOST_CXXFLAGS", "-O2");
- 
-     configure(&mut cc::Build::new())
-         .warnings(false)

srcpkgs/firefox/template

@@ -3,7 +3,7 @@
 # THIS PKG MUST BE SYNCHRONIZED WITH "srcpkgs/firefox-i18n".
 #
 pkgname=firefox
-version=80.0.1
+version=81.0
 revision=1
 build_helper="rust"
 short_desc="Mozilla Firefox web browser"
@@ -11,7 +11,7 @@ maintainer="Johannes <johannes.brechtmann@gmail.com>"
 license="MPL-2.0, GPL-2.0-or-later, LGPL-2.1-or-later"
 homepage="https://www.mozilla.org/firefox/"
 distfiles="${MOZILLA_SITE}/${pkgname}/releases/${version}/source/${pkgname}-${version}.source.tar.xz"
-checksum=596b085e32a2d683ba960e161ea65c6271f90f576d4bf956e0d48e83af992c21
+checksum=9328745012178aee5a4f47c833539f7872cc6e0f20a853568a313e60cabd1ec8
 
 lib32disabled=yes
 
@@ -64,9 +64,7 @@ post_extract() {
 }
 
 post_patch() {
-	_clear_vendor_checksums audio_thread_priority
 	_clear_vendor_checksums num-traits
-	_clear_vendor_checksums glslopt
 }
 
 do_build() {
@@ -153,6 +151,7 @@ do_build() {
 	export MOZ_MAKE_FLAGS="${makejobs}"
 	export MOZ_NOSPAM=1
 	export MOZBUILD_STATE_PATH="${wrksrc}/mozbuild"
+	export MACH_USE_SYSTEM_PYTHON=1
 
 	export AS=$CC
 
@@ -173,6 +172,7 @@ ac_add_options --enable-default-toolkit=$(vopt_if wayland 'cairo-gtk3-wayland' '
 	./mach build
 }
 do_install() {
+	export MACH_USE_SYSTEM_PYTHON=1
 	DESTDIR="$DESTDIR" ./mach install
 
 	vinstall ${FILESDIR}/vendor.js 644 usr/lib/firefox/browser/defaults/preferences