Remove superfluous determination of cURL version (phpGH-16787)

This was originally meant to distinguish between libcurl 7.59.0 and
earlier; only the latter would need to be linked against normalize.lib,
libssh2.lib and nghttp2.lib[1].  That would only have catered to our
builds, and might not have been correct anyway.  However, the version
check was wrong (paren error), and has been removed in the meantime[2].

Given that cURL 7.59.0 is rather old, we do not reinstate the version
check, but rather drop the now superfluous (and improper) determination
of the cURL version.  A nice bonus is that we get rid of some global
variables.

[1] <php@a1ba300>
[2] <php@94a12d5>

Author: cmb69

ext/curl/config.w32

@@ -3,24 +3,13 @@
 ARG_WITH("curl", "cURL support", "no");
 
 if (PHP_CURL != "no") {
-	var ver_num = NaN;
-	var f = PHP_PHP_BUILD + "/include/curl/curlver.h";
-	if (FSO.FileExists(f)) {
-		var reg = /LIBCURL_VERSION_NUM\s+(0x[a-z0-9]+)/gi;
-		var m = reg.exec(file_get_contents(PHP_PHP_BUILD + "/include/curl/curlver.h"));
-		if (!!m && m.length >= 2) {
-			ver_num = parseInt(m[1]);
-		}
-	}
-
 	if (CHECK_LIB("libcurl_a.lib;libcurl.lib", "curl", PHP_CURL) &&
 		CHECK_HEADER_ADD_INCLUDE("curl/easy.h", "CFLAGS_CURL") &&
 		SETUP_OPENSSL("curl", PHP_CURL) >= 2 &&
 		CHECK_LIB("winmm.lib", "curl", PHP_CURL) &&
 		CHECK_LIB("wldap32.lib", "curl", PHP_CURL) &&
 		(((PHP_ZLIB=="no") && (CHECK_LIB("zlib_a.lib;zlib.lib", "curl", PHP_CURL))) ||
 			(PHP_ZLIB_SHARED && CHECK_LIB("zlib.lib", "curl", PHP_CURL)) || (PHP_ZLIB == "yes" && (!PHP_ZLIB_SHARED))) &&
-		!isNaN(ver_num) &&
 		(CHECK_LIB("normaliz.lib", "curl", PHP_CURL) &&
 		 CHECK_LIB("libssh2.lib", "curl", PHP_CURL) &&
 		 CHECK_LIB("nghttp2.lib", "curl", PHP_CURL))