cross-aarch64-gcc12-bootstrap from home:Simmphonie:gcc project

需要 15.4 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/home:Simmphonie:gcc/15.4/home:Simmphonie:gcc.repo
zypper refresh
zypper install cross-aarch64-gcc12-bootstrap