Update rustc's information on Android's sanitizers

This patch updates sanitizier support definitions for Android inside the
compiler.  It also adjusts the logic to make sure no pre-built sanitizer
runtime libraries are emitted as these are instead provided dynamically
on Android targets.

compiler/rustc_target/src/spec/i686_unknown_linux_gnu.rs

@@ -1,9 +1,10 @@
-use crate::spec::{LinkerFlavor, StackProbeType, Target};
+use crate::spec::{LinkerFlavor, SanitizerSet, StackProbeType, Target};
 
 pub fn target() -> Target {
     let mut base = super::linux_gnu_base::opts();
     base.cpu = "pentium4".into();
     base.max_atomic_width = Some(64);
+    base.supported_sanitizers = SanitizerSet::ADDRESS;
     base.add_pre_link_args(LinkerFlavor::Gcc, &["-m32"]);
     // don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
     base.stack_probes = StackProbeType::Call;