CORE-12686
Test the following compilation scenarii:
- using the `pathcch_static` library (function implementations
statically linked into the test);
- using the `pathcch_kernelbase` library (linking directly to
kernelbase.dll);
- using the `pathcch` MS PSDK-compatible library (linking to
the api-ms-win-core-path-l1-1-0.dll APISET dll).
Since the setuplib.dll isn't available after installing ReactOS, build
instead a static library that is then used for the dll, and linked into
the setuplib_unittest, so that it can be run in our test-suite.
Addendum to commit d7c1d220.
CORE-13525
Notes:
- Most of the exported functions have been turned from default cdecl to explicit stdcall / "NTAPI".
- The two InitializeSetup() phases have been collapsed to make the initialization simpler.
Average reductions (percentages; see PR #7523 for actual numbers):
x86 Debug builds:
reactos.exe: 35.1%
smss.exe : 39.8%
Total (including setuplib.dll): 17.9%
x86 Release builds:
reactos.exe: 22.3%
smss.exe : 25.0%
Total (including setuplib.dll): 10.6%
x64 Debug builds:
reactos.exe: 40.6%
smss.exe : 41.6%
Total (including setuplib.dll): 20.0%
x64 Release builds:
reactos.exe: 22.8%
smss.exe : 22.3%
Total (including setuplib.dll): 10.1%
