Linking issues on Visual Studio 9

[ilciavo]

Versions:
Mosquito version 2.0.18
Windows 10 Visual Studio 9

openssl and pthread libraries were installed with vcpkg as follows:

./vcpkg install openssl:x64-windows
./vcpkg install pthread:x64-windows

This results in the following linking errors:

Error LNK2001 unresolved external symbol pthread_mutex_lock
Error LNK2001 unresolved external symbol pthread_mutex_unlock
Error LNK2019 unresolved external symbol pthread_testcancel referenced in function
Error LNK2019 unresolved external symbol pthread_equal referenced in function mosquitto__destroy Error LNK2019 unresolved external symbol pthread_join referenced in function mosquitto__destroy Error LNK2019 unresolved external symbol pthread_self referenced in function mosquitto_new
Error LNK2019 unresolved external symbol pthread_cancel referenced in function mosquitto__destroy Error LNK2019 unresolved external symbol pthread_mutex_init referenced in function mosquitto_reinitialise
Error LNK2019 unresolved external symbol pthread_mutex_destroy referenced in function mosquitto__destroy
Error LNK2019 unresolved external symbol pthread_create referenced in function mosquitto_loop_start

The issue can be solved by updating CMakeLists.txt

#find_package(Threads REQUIRED)
#set (PTHREAD_LIBRARIES Threads::Threads)
find_package(PThreads4W REQUIRED)
set (PTHREAD_LIBRARIES PThreads4W::PThreads4W)

I can create a pull request if anyone is having the same issue.