[poco] Fix the release libraries are linked to debug pcred.dll

[tetsuh]

This merge fixies #6349 but adhoc way.

This is a modified version of PR #5994 to support non-windows platforms.

Note: this find_pcre.patch will be breaked by POCO's upstream modification pocoproject/poco@bd98f5c
So we will need to remake find_pcre.patch when bump up ports/poco/portfile.cmake.

Usually, this problem should be solved by POCO or PCRE itself by providing FindPCRE.cmake.
In the meantime, I would like to apply this patch to keep the correct POCO build on vcpkg.

Initially, #5543 considered to include #5994 but finally excluded. because it looks a special kind of butterfly between #304 and #5994. I hope this fixes these butterfly issue too.

[cbezault]

I think this can be implemented in a vcpkg-wrapper. Take a look at scripts/buildsystems/vcpkg.cmake. We intercept all calls to find_package and replace it with a macro.

Also see #7203

[tetsuh]

Thnx. I try vcpkg-wrapper.

[JackBoosY]

@tetsuh I think #7698 would be better.

[tetsuh]

@JackBoosY Yes, #7698 is better way that use select_library_configurations ().

[tetsuh]

@cbezault I've tried putting ports/pcre/vcpkg-cmake-wrapper.cmake and I saw how it working to override find_package(pcre). then, I thought that it would be better to put pcre-config.cmake because that would allow find_package(pcre) other than vcpkg.
Anyway, at the moment I couldn't reach a good solution.