Enable Clang's -ftrivial-auto-var-init=zero on 17.1

Just like Android 11+

Signed-off-by: Tad <tad@spotco.us>

Patches/LineageOS-17.1/android_build_soong/0002-auto_var_init.patch

@@ -0,0 +1,21 @@
+From af24d46eff1f846432eb5e9ff8365edde901addd Mon Sep 17 00:00:00 2001
+From: Daniel Micay <danielmicay@gmail.com>
+Date: Wed, 8 Apr 2020 10:42:11 -0400
+Subject: [PATCH] enable -ftrivial-auto-var-init=zero
+
+---
+ cc/config/global.go | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/cc/config/global.go b/cc/config/global.go
+index 7c7b47a51..26806ce18 100644
+--- a/cc/config/global.go
++++ b/cc/config/global.go
+@@ -58,6 +58,7 @@ var (
+ 		"-fno-short-enums",
+ 		"-funwind-tables",
+ 		"-fstack-protector-strong",
++		"-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang",
+ 		"-Wa,--noexecstack",
+ 		"-D_FORTIFY_SOURCE=2",
+ 

Scripts/LineageOS-17.1/Patch.sh

@@ -101,6 +101,7 @@ fi;
 
 if enterAndClear "build/soong"; then
 applyPatch "$DOS_PATCHES/android_build_soong/0001-Enable_fwrapv.patch"; #Use -fwrapv at a minimum (GrapheneOS)
+applyPatch "$DOS_PATCHES/android_build_soong/0002-auto_var_init.patch"; #Enable -ftrivial-auto-var-init=zero (GrapheneOS)
 fi;
 
 if enterAndClear "device/qcom/sepolicy-legacy"; then