emsc: fix static lib only #236

Job	Run time
coverage - measure	2m 11s
sanitizer - arm64v8/debian:bookworm	2m 55s
sanitizer - debian:bookworm	2m 15s
sanitizer - arm32v7/debian:bookworm	3m 46s
msys2 - mingw64	4m 7s
android	4m 6s
linux - arm64v8/debian:bookworm	3m 14s
vcpkg - linux \|	2m 34s
conan - linux \|	1m 49s
linux - debian:bookworm	1m 56s
linux - arm32v7/debian:bookworm	4m 16s
linux - igagis/raspbian:bookworm	2m 40s
conan - emscripten \|	1m 59s
conan - macos-latest	1m 19s
linux - ubuntu:noble	1m 45s
ios	1m 0s
macosx	2m 51s
msys2 - mingw32	3m 27s
msvs	3m 26s
	51m 36s

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