Tweak the OSS gflags dependency inference logic
Summary: The current logic for "which gflags library should we use" checks for the first library (e.g., libgflags vs. libgflags-shared) listed as a TARGET. Unfortunately, on some number of systems, the gflags-config.cmake (read: the file that is supposed to tell you how to use gflags with cmake) actually defines (but doesn't use!) libraries that don't exist (!) so this logic breaks. Instead, use the system defined gflags_LIBRARIES variable which explicitly tells us which library to use. Reviewed By: yfeldblum, simpkins Differential Revision: D14512966 fbshipit-source-id: add4ecf6bade502b2d12aad2bdfcf0476eeba465
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