Binary package “mingw-w64-x86-64-dev” in ubuntu focal

Development files for MinGW-w64 targeting Win64

 MinGW-w64 provides a development and runtime environment for 32- and
 64-bit (x86 and x64) Windows applications using the Windows API and
 the GNU Compiler Collection (gcc).
 This package contains the headers and libraries required to build
 64-bit software using MinGW-w64.
 The wine64 package can be used to test software built using MinGW-w64
 without using Windows.