Fix build failure on CentOS for MariaDB official CI

The gcc version in CentOS 7 is 4.8.2 (released in Mar 2013).
But Arm added the support for 'arm_acle.h' in gcc 5.1 (released in Jun 2014).
And there are also some bugs in Arm gcc 4.8.
The patch is to detect GCC(greater than 5.1) version for Arm crc32c.

Change-Id: I718b9b89f952fed72c8795a176ebbe5395c8dd5e
Signed-off-by: Yuqi Gu <yuqi.gu@arm.com>

cmake/crc32.cmake

 IF(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|AARCH64")
+  IF(CMAKE_COMPILER_IS_GNUCC AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 5.1)
     include(CheckCXXSourceCompiles)
 
     CHECK_CXX_SOURCE_COMPILES("
@@ -25,10 +26,11 @@ IF(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|AARCH64")
 
     SET(CRC32_LIBRARY crc32_armv8_neon)
     ADD_SUBDIRECTORY(extra/crc32_armv8_neon)
+  ENDIF()
 ENDIF()
 
 IF(CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64")
-    SET(HAVE_CRC32_VPMSUM 1)
-    SET(CRC32_LIBRARY crc32-vpmsum)
-    ADD_SUBDIRECTORY(extra/crc32-vpmsum)
+  SET(HAVE_CRC32_VPMSUM 1)
+  SET(CRC32_LIBRARY crc32-vpmsum)
+  ADD_SUBDIRECTORY(extra/crc32-vpmsum)
 ENDIF()