Add srhines to the OWNERS for clang.go and global.go.

These files contain the flags and selection logic for our C/C++
toolchain.

Test: N/A
Change-Id: I860ea34c226ec01ae4127a18d80e1c8be6393a83
diff --git a/OWNERS b/OWNERS
index c0c3762..121a441 100644
--- a/OWNERS
+++ b/OWNERS
@@ -7,3 +7,5 @@
 per-file * = nanzhang@google.com
 per-file *gen_stub_libs.py = danalbert@google.com
 per-file ndk_*.go = danalbert@google.com
+per-file clang.go = srhines@google.com
+per-file global.go = srhines@google.com