makefile: Add manylinux-x64 to top level targets
makefile: Add manylinux-x64 to top level targets

thewtex/cross-compilers,dockcross/dockcross,thewtex/cross-compilers,thewtex/cross-compilers,thewtex/cross-compilers,dockcross/dockcross,dockcross/dockcross,dockcross/dockcross