[04/11] msi/tests: Prepare install.c for the switch to -D__WINESRC__.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://newtestbot.winehq.org/JobDetails.pl?Key=2763

Your paranoid android.


=== wxppro (32 bit install) ===
No test summary line found
Failure running script in VM: network read timed out

=== wvista (32 bit install) ===
Timeout

=== w2008s64 (32 bit install) ===
Failure running script in VM: network read timed out

=== w7pro64 (32 bit install) ===
Timeout
Failure running script in VM: timed out waiting for the child process 

=== w864 (32 bit install) ===
install.c:2439: Test failed: Directory not created

=== w2008s64 (64 bit install) ===
Timeout