[open62541] don't force static CRT anymore

[JulZimmermann]

Don't force the use of static CRT on Windows anymore.

This is a fix for costume triplets using something like this:

set(VCPKG_LIBRARY_LINKAGE static)
set(VCPKG_CRT_LINKAGE dynamic)

Without this PR the post-build validation outputs:

warning: The following binaries should use the Dynamic Debug (/MDd) CRT.
  C:\dev\vcpkg\packages\open62541_x64-windows-v143\debug\lib\open62541d.lib links with: Static Debug (/MTd)
To inspect the lib files, use:
  dumpbin.exe /directives mylibfile.lib
warning: The following binaries should use the Dynamic Release (/MD) CRT.
  C:\dev\vcpkg\packages\open62541_x64-windows-v143\lib\open62541.lib links with: Static Release (/MT)
To inspect the lib files, use:
  dumpbin.exe /directives mylibfile.lib
error: Found 2 post-build check problem(s). To submit these ports to curated catalogs, please first correct the portfile: C:\dev\vcpkg_ports\ports\open62541\portfile.cmake

• Changes comply with the maintainer guide
• SHA512s are updated for each updated download
• The "supports" clause reflects platforms that may be fixed by this new version
• Any fixed CI baseline entries are removed from that file.
• Any patches that are no longer applied are deleted from the port's directory.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is added to each modified port's versions file.