Revert "Remove unneeded -Wno-constant-logical-operand flag"

This reverts commit 4f0ce757aa2bc039bf143087fe586d9b587c5e5c.

Reason for revert: Breaks several targets in internal git_master, e.g. http://ab/5165971.

Test: Build failing library
Change-Id: I02a5ade05a76b24020586c55a4e8f441ca7708a9
diff --git a/cc/config/clang.go b/cc/config/clang.go
index 0b2190c..46d8528 100644
--- a/cc/config/clang.go
+++ b/cc/config/clang.go
@@ -186,6 +186,9 @@
 		// compatibility.
 		"-Wno-c++98-compat-extra-semi",
 
+		// Disable this warning until we can fix all instances where it fails.
+		"-Wno-constant-logical-operand",
+
 		// Disable this warning because we don't care about behavior with older compilers.
 		"-Wno-return-std-move-in-c++11",