HADOOP-19662. Remove duplicate include of gcc_optimizations.h in bulk_crc32_x86.c

Removes duplicate #include "gcc_optimizations.h" statement.

Author: PeterPtroc

hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/bulk_crc32_x86.c

@@ -27,7 +27,6 @@
 
 #include  "bulk_crc32.h"
 #include "gcc_optimizations.h"
-#include "gcc_optimizations.h"
 
 ///////////////////////////////////////////////////////////////////////////
 // Begin code for SSE4.2 specific hardware support of CRC32C