lib/cpp/test/Security*Test.cpp: Fix the check for OpenSSL version macro

[emmenlau]

This commit fixes the current build problem on MSVC (see i.e. https://ci.appveyor.com/project/ApacheSoftwareFoundation/thrift/builds/48238772/job/cyh9vdh0xsiadd01)

C:\projects\thrift\lib\cpp\test\SecurityFromBufferTest.cpp(202): error C2065: 'OPENSSL_VERSION_MAJOR': undeclared identifier [C:\projects\build\MSVC2017\x64\lib\cpp\test\SecurityFromBufferTest.vcxproj]
C:\projects\thrift\lib\cpp\test\SecurityTest.cpp(224): error C2065: 'OPENSSL_VERSION_MAJOR': undeclared identifier 

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[emmenlau]

According to https://ci.appveyor.com/project/ApacheSoftwareFoundation/thrift/builds/48252307/job/acjss7apkwg7w8wg and https://ci.appveyor.com/project/ApacheSoftwareFoundation/thrift/builds/48252307/job/0u6aevdbkpv6s45a this PR fixes the build problem on MSVC, while not breaking other builds.