message: Add submodules target to main makefile
  Adds a submodules convenience target to main makefile. Submodules must
  be initialized before other targets can run successfully.
diff: @@ -51,7 +51,7 @@ WEAKEN_SYMBOLS=\
  -W __umodti3 \
  -W __rust_probestack
  -.PHONY: all clean fmt install install-headers libs test
  +.PHONY: all clean fmt install install-headers libs submodules test
  all: | libs
  @@ -96,6 +96,10 @@ install-libs: libs
  install: install-headers install-libs
  +submodules:
  + git submodule sync
  + git submodule update --init --recursive
  +
  sysroot: all
  rm -rf $@
  rm -rf $@.partial
  