Pass -C panic=abort to rustc linux bionic compilations

Pass -C panic=abort to rustc when targeting linux bionic to match
device bionic builds.  Fixes building on master-art-host when a
rust dependency is added to the linux bionic target.

Bug: 268035710
Test: master-art-host linux bionic build
Change-Id: I411a8622002709030dfd207b9decb8846a1ccef3

rust/config/x86_linux_bionic_host.go

@@ -21,7 +21,9 @@ import (
 )
 
 var (
-	LinuxBionicRustFlags     = []string{}
+	LinuxBionicRustFlags = []string{
+		"-C panic=abort",
+	}
 	LinuxBionicRustLinkFlags = []string{
 		"-B${cc_config.ClangBin}",
 		"-fuse-ld=lld",