Use the cross-compilation tool to generate arm64 litecov.

[secnotes]

This PR allows us to generate arm64 litecov in an x86 Linux environment using cross-compilation tools. The advantage of using cross-compilation is that you can generate Tinyinst binaries that can be used by Android or other arm64 systems without the need for Android NDK.

Tip: Of course, in this environment, when compiling, we often need to generate a statically linked binary. Therefore, please add the build option -DCMAKE_EXE_LINKER_FLAGS=-static