WASM build step does something weird with prefix

[zooba]

I have a build that uses a full path for configure --prefix=....

As of 3.11.0b1, this path is combined in the Makefile with a . for WASM_ASSETS_DIR which then is used for WASM_STDLIB, which is then passed to rm -rf in clean-retain-profile.

cpython/Makefile.pre.in

Lines 249 to 251 in a834e2d

	# assets for Emscripten browser builds
	WASM_ASSETS_DIR=".$(prefix)"
	WASM_STDLIB="$(WASM_ASSETS_DIR)/local/lib/python$(VERSION)/os.py"

cpython/Makefile.pre.in

Line 2385 in a834e2d

-rm -rf $(WASM_STDLIB)

Because my path does not combine nicely, the above rm -rf seems to be wrong:

rm -rf ""./home/vsts/work/1/a/layout"/local/lib/python3.11/os.py"
...

(Why we're trying to rm -r a single file I don't even know, but maybe there's a reason.)

Any ideas? @tiran?

[brettcannon]

This looks to be Emscripten-specific, so dropping the WASI label.