[cmake] Fix check for debug static build of pcre2

[tobil4sk]

The correct name is pcre2-8-staticd.lib, not pcre2-8d-static.lib.

If the static debug build is the only one available, the value of default_pcre_libraries would previously default to pcre.lib, and so there was a linking error if this library did not exist.

Now the library will be correctly detected, which avoids errors if the static debug build is the only one available.

[tobil4sk]

Any chance this could be merged? This can be verified in the pcre2 cmake file:

The library name is pcre2-8-static: https://github.com/PCRE2Project/pcre2/blob/44d95814f6414d40de6300817ae9d2bec0babc39/CMakeLists.txt#L703

And the d suffix comes after the library name, from CMAKE_DEBUG_POSTFIX: https://github.com/PCRE2Project/pcre2/blob/44d95814f6414d40de6300817ae9d2bec0babc39/CMakeLists.txt#L584