Fix two bugs that caused 3rd party release failure

Summary:

* Fix the link to gflags.
* Fix a warning for the uninitialized data member.

build_tools/fbcode.clang31.sh

@@ -43,7 +43,7 @@ EXEC_LDFLAGS+=" -B$TOOLCHAIN_EXECUTABLES/binutils/binutils-2.21.1/da39a3e/bin"
 
 PLATFORM_LDFLAGS="-L$TOOLCHAIN_LIB_BASE/libgcc/libgcc-4.7.1/afc21dc/lib -L$TOOLCHAIN_LIB_BASE/glibc/glibc-2.14.1/99df8fc/lib"
 
-EXEC_LDFLAGS_SHARED="$SNAPPY_LIBS"
+EXEC_LDFLAGS_SHARED="$SNAPPY_LIBS $ZLIB_LIBS $GFLAGS_LIBS"
 SNAPPY_LDFLAGS="$SNAPPY_LIBS"
 
 export CC CXX AR RANLIB CFLAGS EXEC_LDFLAGS EXEC_LDFLAGS_SHARED SNAPPY_LDFLAGS

build_tools/fbcode.gcc471.sh

@@ -52,7 +52,7 @@ EXEC_LDFLAGS+=" $HDFSLIB $SNAPPY_LIBS $ZLIB_LIBS $LIBEVENT_LIBS $GFLAGS_LIBS"
 
 PLATFORM_LDFLAGS="-L$TOOLCHAIN_LIB_BASE/libgcc/libgcc-4.7.1/afc21dc/lib -L$TOOLCHAIN_LIB_BASE/glibc/glibc-2.14.1/99df8fc/lib"
 
-EXEC_LDFLAGS_SHARED="$SNAPPY_LIBS $ZLIB_LIBS"
+EXEC_LDFLAGS_SHARED="$SNAPPY_LIBS $ZLIB_LIBS $GFLAGS_LIBS"
 SNAPPY_LDFLAGS="$SNAPPY_LIBS $ZLIB_LIBS"
 
 VALGRIND_VER="$TOOLCHAIN_LIB_BASE/valgrind/valgrind-3.8.1/91ddd43/bin/"

include/rocksdb/transaction_log.h

@@ -52,7 +52,7 @@ class LogFile {
 };
 
 struct BatchResult {
-  SequenceNumber sequence;
+  SequenceNumber sequence = SequenceNumber();
   std::unique_ptr<WriteBatch> writeBatchPtr;
 };