build: added libexpat build support #13

Job	Run time
build (build, x86_64)	3m 51s
build (build, x86_64)	3m 47s
build (build, arm)	4m 8s
build (build, arm)	4m 8s
build (build, aarch64)	4m 6s
build (build, aarch64)	4m 6s
build (build, powerpc)	4m 6s
build (build, powerpc)	4m 6s
build (build, mips)	4m 4s
build (build, mips)	4m 4s
build (build, mipsel)	4m 7s
build (build, mipsel)	4m 7s
build (build-with-python, x86_64)	4m 7s
build (build-with-python, x86_64)	4m 7s
build (build-with-python, arm)	4m 5s
build (build-with-python, arm)	4m 5s
build (build-with-python, aarch64)	4m 7s
build (build-with-python, aarch64)	4m 7s
build (build-with-python, powerpc)	4m 6s
build (build-with-python, powerpc)	4m 6s
build (build-with-python, mips)	4m 7s
build (build-with-python, mips)	4m 7s
build (build-with-python, mipsel)	4m 5s
build (build-with-python, mipsel)	4m 5s
	1h 37m 54s

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