Setup git submodules so googletest is fetched, unbreaking alpine in releases (#4640)
Setup git submodules so googletest is fetched, unbreaking alpine in releases (#4640)

Without this the CMake step fails on not finding

googletest/googletest/src/gtest_main.cc

Fixes #4639
WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen