Use the latest build scripts for building php 7.2 in appveyor

[yitam]

This change is 

[coveralls]

Coverage remained the same at 73.228% when pulling 246824a on yitam:php72 into 16e0b89 on Microsoft:dev.

[codecov-io]

Codecov Report

Merging #757 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #757   +/-   ##
=======================================
  Coverage   78.85%   78.85%           
=======================================
  Files          25       25           
  Lines        7157     7157           
=======================================
  Hits         5644     5644           
  Misses       1513     1513

Impacted Files	Coverage Δ
...-7.1.16-src/ext/pdo_sqlsrv/shared/core_results.cpp
...x86/php-7.1.16-src/ext/pdo_sqlsrv/php_pdo_sqlsrv.h
...x86/php-7.1.16-src/ext/sqlsrv/shared/core_util.cpp
...cts/php/x86/php-7.1.16-src/ext/sqlsrv/php_sqlsrv.h
...x86/php-7.1.16-src/ext/sqlsrv/shared/core_init.cpp
...x86/php-7.1.16-src/ext/sqlsrv/shared/core_sqlsrv.h
...rojects/php/x86/php-7.1.16-src/ext/sqlsrv/util.cpp
...x86/php-7.1.16-src/ext/sqlsrv/shared/core_stmt.cpp
.../php-7.1.16-src/ext/sqlsrv/shared/core_results.cpp
...php-7.1.16-src/ext/pdo_sqlsrv/shared/core_conn.cpp
... and 40 more

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