Windows & PHP 7.4 fixes

[Jan-E]

This PR solves a couple of issues.

PHP 7.4: change ulong to unsigned long and uint to uint32_t

Windows builds:

• Fix operator error which does not exist in Visual Studio
• Check for OpenSSL 1.1.1 libs first, then for OpenSSL 1.0.2 libs
• Add Curl dependent libs

[codecov]

Codecov Report

Merging #96 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #96   +/-   ##
=======================================
  Coverage   87.17%   87.17%           
=======================================
  Files          42       42           
  Lines        9686     9686           
=======================================
  Hits         8444     8444           
  Misses       1242     1242

Impacted Files	Coverage Δ
src/php_http_curl.c	85.71% <ø> (ø)	⬆️
src/php_http_client_curl.c	81.91% <ø> (ø)	⬆️
src/php_http_filter.c	81.64% <ø> (ø)	⬆️
src/php_http_message_parser.c	85.66% <100%> (ø)	⬆️
src/php_http_options.c	75% <100%> (ø)	⬆️
src/php_http_etag.c	98.07% <100%> (ø)	⬆️
src/php_http_encoding.c	88.25% <100%> (ø)	⬆️
src/php_http_querystring.c	93.28% <100%> (ø)	⬆️
src/php_http_message_body.c	87.92% <100%> (ø)	⬆️

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[Jan-E]

The same results in the Travis check. Merging.

[Jan-E]

@m6w6 Is it time for a new release with the Windows fixes?