Extract the contents of Python wheel file to Anki's Python library to load it
directly from that place.  The .so file will be used for installation later.

Rust from Ports is used as well so there is no need to bootstrap it via
"rustup".

--- rspy/Makefile.orig	2020-08-30 01:23:44 UTC
+++ rspy/Makefile
@@ -71,6 +71,7 @@ build: .build/build
 	touch ../proto/backend.proto
 	${BUILD_VARIABLES} \
 		maturin build -i "${PYTHON_FILE}" -o "$(OUTDIR)" $(BUILDFLAGS)
+	%%UNZIP_NATIVE_CMD%% -o -d ../pylib/ `find ../dist/ -name "*.whl"`
 	touch $@
 
 check: .build/check
@@ -87,10 +88,6 @@ clean:
 RUST_TOOLCHAIN := $(shell cat rust-toolchain)
 
 .build/tools: requirements.txt rust-toolchain
-	python -m pip install -r requirements.txt
-	rustup toolchain install $(RUST_TOOLCHAIN)
-	rustup component add rustfmt-preview --toolchain $(RUST_TOOLCHAIN)
-	rustup component add clippy-preview --toolchain $(RUST_TOOLCHAIN)
 	@touch $@
 
 # we should not call clippy because it break things when running make check Mac OS