Modified version.h for 5.2.1-preview

[yitam]

This change is 

[codecov-io]

Codecov Report

Merging #780 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #780   +/-   ##
=======================================
  Coverage   80.06%   80.06%           
=======================================
  Files          25       25           
  Lines        7323     7323           
=======================================
  Hits         5863     5863           
  Misses       1460     1460

Impacted Files	Coverage Δ
...p-7.1.17-src/ext/pdo_sqlsrv/shared/core_stream.cpp
...x86/php-7.1.17-src/ext/sqlsrv/shared/core_stmt.cpp
...phpdev/vc14/x86/php-7.1.17-src/ext/sqlsrv/stmt.cpp
...x86/php-7.1.17-src/ext/sqlsrv/shared/core_util.cpp
...x86/php-7.1.17-src/ext/sqlsrv/shared/core_sqlsrv.h
...php-7.1.17-src/ext/pdo_sqlsrv/shared/core_util.cpp
...c14/x86/php-7.1.17-src/ext/pdo_sqlsrv/pdo_init.cpp
.../php-7.1.17-src/ext/sqlsrv/shared/core_results.cpp
...phpdev/vc14/x86/php-7.1.17-src/ext/sqlsrv/util.cpp
...phpdev/vc14/x86/php-7.1.17-src/ext/sqlsrv/init.cpp
... and 40 more

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[coveralls]

Coverage remained the same at 74.697% when pulling d26440b on yitam:version into f0eefaf on Microsoft:dev.

[david-puglielli]

SEMVER_BUILDMETA is empty unless SQLVERSION_BUILD is not 0, but when is SQLVERSION_BUILD not zero?

[yitam]

The build scripts take care of setting the SQLVERSION_BUILD, see this line

https://github.com/Microsoft/msphpsql/blob/master/buildscripts/buildtools.py?utf8=%E2%9C%93#L269