community/firefox-esr: attempt to fix crashing tabs with musl 1.2.2

This commit has not been tested locally, but firefox is completely
broken at the moment anyhow so let's just see if this fixes it...

OK Ariadne@

community/firefox-esr/APKBUILD

@@ -5,7 +5,7 @@ pkgname=firefox-esr
 pkgver=78.3.1
 # Date of release, YY-MM-DD for metainfo file (see package())
 _releasedate=2020-10-01
-pkgrel=0
+pkgrel=1
 pkgdesc="Firefox web browser - Extended Support Release"
 url="https://www.mozilla.org/en-US/firefox/organizations/"
 # Limited on:
@@ -75,6 +75,7 @@ source="https://ftp.mozilla.org/pub/firefox/releases/${pkgver}esr/source/firefox
 	disable-neon-in-aom.patch
 	sandbox-fork.patch
 	sandbox-sched_setscheduler.patch
+	sandbox-tiocswinsz.patch
 	"
 
 subpackages="$pkgname-npapi"
@@ -413,4 +414,5 @@ f3b7c3e804ce04731012a46cb9e9a6b0769e3772aef9c0a4a8c7520b030fdf6cd703d5e9ff49275f
 bb75b2abda86e455d81571052a2cfec5a9d858ffa91c50a7217b4b6c02cbfc0400e9114a27bd54ce78d7d3a44e9b03927cf0317654d98c0f39d26c63c9670117  remove-faulty-libvpx-check.patch
 f963fcdba7307a0b1712dfb95ceba4ab49f449f60e550bb69d15d50272e6df9add90862251ee561e4ea5fd171a2703552ffa7aade92996f5f0b3e577f1544a6d  disable-neon-in-aom.patch
 4911ddb41bef8d9f6d6200159cde465627e940fe1c09099be55769d21a5a52a3f737e1bf803daa96126c035b091aea880fbc5d2e6cf5da96ddd17322461a72d6  sandbox-fork.patch
-db26757b2ebf9f567962e32294b4ae48b3a5d0378a7589dfe650fe3a179ff58befbab5082981c68e1c25fb9e56b2db1e4e510d4bca17c3e3aedbf9a2f21806eb  sandbox-sched_setscheduler.patch"
+db26757b2ebf9f567962e32294b4ae48b3a5d0378a7589dfe650fe3a179ff58befbab5082981c68e1c25fb9e56b2db1e4e510d4bca17c3e3aedbf9a2f21806eb  sandbox-sched_setscheduler.patch
+f19104d5b4c38165375835b5e586d9008bdfa69dc07ef39b48080f5103c682a989aaa3aa0200d9410b27c6f164404e3d54973547897cad098f703b21c26476d4  sandbox-tiocswinsz.patch"

community/firefox-esr/sandbox-tiocswinsz.patch

+musl >= 1.2.2 uses ioctl with TIOCSWINSZ internally. The ioctl
+systemcall with this option must be added to the firefox sandbox
+systemcall whitelist.
+
+See: https://git.musl-libc.org/cgit/musl/commit/?id=4d5786544bb52c62fc1ae84d91684ef2268afa05
+
+diff -upr firefox-82.0.orig/security/sandbox/linux/SandboxFilter.cpp firefox-82.0/security/sandbox/linux/SandboxFilter.cpp
+--- firefox-82.0.orig/security/sandbox/linux/SandboxFilter.cpp	2020-10-31 12:35:45.815282945 +0100
++++ firefox-82.0/security/sandbox/linux/SandboxFilter.cpp	2020-10-31 12:53:16.596449933 +0100
+@@ -1619,6 +1619,9 @@ class SocketProcessSandboxPolicy final :
+             // ffmpeg, and anything else that calls isatty(), will be told
+             // that nothing is a typewriter:
+             .ElseIf(request == TCGETS, Error(ENOTTY))
++            // musl uses TIOCSWINSZ internally.
++            // See https://git.musl-libc.org/cgit/musl/commit/?id=4d5786544bb52c62fc1ae84d91684ef2268afa05
++            .ElseIf(request == TIOCSWINSZ, Allow())
+             // Allow anything that isn't a tty ioctl, for now; bug 1302711
+             // will cover changing this to a default-deny policy.
+             .ElseIf(shifted_type != kTtyIoctls, Allow())