2fda0c7851 doc: Drop no longer required notes for Windows builds (Hennadii Stepanov)
f09ed92be1 build: Try posix-specific CXX first for mingw32 host (Hennadii Stepanov)
Pull request description:
On master (1186910b6b), when cross-compiling for Windows using our depends build system, we must manually choose the POSIX thread model for the `x86_64-w64-mingw32-g++` compiler.
This PR improves the build system to make this choice automa**g**ically.
ACKs for top commit:
jarolrod:
re-ACK 2fda0c7851
shaavan:
tACK 2fda0c7851
Tree-SHA512: ad3bbdfe84b3c8eb56e102aa0abdc76fd864b2724ac59c9a12a798c57d1c5a1172682172588019d5d1715801a9f201fd9424effbd858e8dc30607c23c0d5941f