emsc: fix static lib only #406

Job	Run time
coverage - measure	3m 19s
sanitizer - arm32v7/debian:bookworm \| ubuntu-24.04-arm	3m 8s
sanitizer - arm64v8/debian:bookworm \| ubuntu-24.04-arm	2m 30s
sanitizer - debian:bookworm \|	1m 52s
macosx	2m 48s
msys2 - mingw32	4m 6s
conan - linux \|	2m 34s
vcpkg - linux \|	4m 42s
ios	1m 28s
conan - emscripten \|	2m 33s
msys2 - mingw64	3m 33s
android	4m 13s
conan - macos-latest	2m 36s
msvs	12m 5s
linux - debian:bookworm	2m 33s
linux - arm64v8/debian:bookworm	3m 15s
linux - ubuntu:noble	2m 43s
linux - arm32v7/debian:bookworm	4m 6s
	1h 4m 4s

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