kernel32/tests: Fix actctx tests on Vista+ (try 3)

[Ge van Geldorp]

Fighting the EOL problem...

Vista and higher seem to cache the presence/absence of external .manifest files.
When starting "kernel32_test.exe actctx" Windows appears to record that no
kernel32_test.exe.manifest file is present. As part of the test, we create that
manifest file and launch "kernel32_test.exe actctx manifest1" to do some tests
with an external .manifest file. However, Windows simply doesn't seem to load
the .manifest in the child process.

If I start from a clean snapshot, manually create the .manifest file and then
run the child test ("kernel32_test.exe actctx manifest1") the child test runs
fine. After removing the .manifest file and running the parent test
("kernel32_test.exe actctx") the child will still load the .manifest correctly.

Changing the last modified date of the executable appears to prevent the cache
from being used.
---
 dlls/kernel32/tests/actctx.c |   30 ++++++++++++++++++++++--------
 1 files changed, 22 insertions(+), 8 deletions(-)

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