Don't treat warnings as error when building release
Summary: This will reduce errors reported by open source by 90%. Developers should have warnings break their compile. Users shouldn't. Test Plan: make dbg: g++ -g -W -Wextra -Wall -Wsign-compare -Wshadow -Wno-unused-parameter -Werror -I. -I./include -std=c++11 -DROCKSDB_PLATFORM_POSIX -DOS_LINUX -fno-builtin-memcmp -DROCKSDB_FALLOCATE_PRESENT -DSNAPPY -DGFLAGS=gflags -DZLIB -DBZIP2 -march=native -isystem ./third-party/gtest-1.7.0/fused-src -Woverloaded-virtual -Wn on-virtual-dtor -Wno-missing-field-initializers -c db/repair.cc -o db/repair.o make all: g++ -g -W -Wextra -Wall -Wsign-compare -Wshadow -Wno-unused-parameter -Werror -I. -I./include -std=c++11 -DROCKSDB_PLATFORM_POSIX -DOS_LINUX -fno-builtin-memcmp -DROCKSDB_FALLOCATE_PRESENT -DSNAPPY -DGFLAGS=gflags -DZLIB -DBZIP2 -march=native -isystem ./third-party/gtest-1.7.0/fused-src -O2 -fno-omit-frame-pointer -momit-leaf-frame-pointer -Woverloaded-virtual -Wnon-virtual-dtor -Wno-missing-field-initializers -c db/repair.cc -o db/repair.o make static_lib: g++ -g -W -Wextra -Wall -Wsign-compare -Wshadow -Wno-unused-parameter -I. -I./include -std=c++11 -DROCKSDB_PLATFORM_POSIX -DOS_LINUX -fno-builtin-memcmp -DROCKSDB_FALLOCATE_PRESENT -DSNAPPY -DGFLAGS=gflags -DZLIB -DBZIP2 -march=native -isystem ./third-party/gtest-1.7.0/fused-src -O2 -fno-omit-frame-pointer -momit-leaf-frame-pointer -DNDEBUG -Woverloaded-virtual -Wnon-virtual-dtor -Wno-missing-field-initializers -c db/repair.cc -o db/repair.o Reviewers: sdong, yhchiang, rven Reviewed By: rven Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D38031
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