Fix includes in FingerprintPolynomial.h

Summary:
Add a missing include in `folly/detail/FingerprintPolynomial.h` to fix the
modular build.

Reviewed By: andrewjcg

Differential Revision: D9182707

fbshipit-source-id: c498b10bd02f6528a62fce8145521a97755d6496

folly/detail/FingerprintPolynomial.h

@@ -18,6 +18,8 @@
 
 #include <cstdint>
 
+#include <glog/logging.h>
+
 namespace folly {
 namespace detail {