Christoph M. Becker e6044d4455 Fix #55847: DOTNET .NET 4.0 GAC new location ...

If we do not specify the exact version of the .NET framework to use,
the default CLR is loaded, which is typically CLR 2, which is very old.
Therefore, we introduce a `PHP_INI_SYSTEM` setting, which allows users
to choose the desired .NET framework version.  The value of the setting
are the first three parts of the framework's version number, separated
by dots, and prefixed with "v", e.g. "v4.0.30319".  If the value of the
INI setting is `NULL` (the default) or an empty string, the default CLR
is used.

Internally, we switch from the most generic `CoCreateInstance()` to
`CorBindToRuntime()` which is implemented in mscoree.dll.  To avoid the
hard dependency to that library, we load dynamically.

So this fix is supposed to be fully backwards compatible.

Closes GH-5949

2020-08-22 12:42:34 +02:00

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