Revert "Remove Windows syslog script and syslog.reg"

This reverts commit cc44bad1f6, since its
assumptions were not correct.  Actually, the classic event logging is
still used by PHP, because Windows 7 is still to be supported for a
while.  Without the respective registry entries, the event log entries
show an error message regarding missing ID descriptions.

Thanks to ab@php.net for hinting at this!

Obviously, the part depending on ext/win32std has still to be
overhauled, and further improvements are conceivable; we will address
this in due course.

win32/build/Makefile

@@ -261,3 +261,6 @@ really-install:
 	@type nul > $(BUILD_DIR)\extension_dlls.txt
 	@if exist $(BUILD_DIR)\php_*.dll copy $(BUILD_DIR)\php_*.dll $(PHP_PREFIX)\ext /y >nul & dir /b $(BUILD_DIR)\php_*.dll > $(BUILD_DIR)\extension_dlls.txt
 	@xcopy $(BUILD_DIR)\*.dll /exclude:$(BUILD_DIR)\extension_dlls.txt $(PHP_PREFIX) /y >nul
+	@echo Registering event source with syslog (requires admin rights)
+	@echo It's okay for this step to fail:
+	-$(PHP_PREFIX)\php.exe -n -dextension_dir=$(PHP_PREFIX) win32/build/registersyslog.php $(PHP_PREFIX)\$(PHPDLL)

win32/build/registersyslog.php

@@ -0,0 +1,44 @@
+<?php
+
+/* This script sets up an event source for use by the php syslog() function. */
+
+if (!extension_loaded("win32std")) {
+	@dl("php_win32std.dll");
+}
+
+$PATH = "SYSTEM\\CurrentControlSet\\Services\\Eventlog\\Application\\PHP-" . phpversion();
+
+$dll = $argv[1];
+
+if (extension_loaded("win32std")) {
+	$key = @reg_create_key(HKEY_LOCAL_MACHINE, $PATH, KEY_ALL_ACCESS);
+
+	if (!$key)
+		$key = reg_open_key(HKEY_LOCAL_MACHINE, $PATH, KEY_ALL_ACCESS);
+
+	if ($key) {
+		reg_set_value($key, "TypesSupported", REG_DWORD, 7) or die("Types");
+		reg_set_value($key, "EventMessageFile", REG_SZ, $dll) or die("EventMessageFile");
+
+		syslog(LOG_NOTICE, "Registered PHP Event source");
+	} else {
+		echo "Could not register event source\n";
+	}
+}
+
+/* let's also generate/update the bundled .reg file */
+
+$dll = addslashes($dll);
+
+file_put_contents("win32/syslog.reg", <<<REG
+REGEDIT4
+
+[HKEY_LOCAL_MACHINE\\$PATH]
+"TypesSupported"=dword:00000007
+"EventMessageFile"="$dll"
+
+REG
+);
+
+
+?>

win32/syslog.reg

@@ -0,0 +1,5 @@
+REGEDIT4
+
+[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog\Application\PHP-7.3.0-dev]
+"TypesSupported"=dword:00000007
+"EventMessageFile"="g:\\test\\srctrunkinstall\\php7ts.dll"