Add CFLAGS and LDFlAGS for building lxml #717

Job	Run time
cache_libs / cache_libs (windows-11-arm)	38s
cache_libs / cache_libs (ubuntu-22.04-arm)	17s
cache_libs / cache_libs (windows-2022)	31s
cache_libs / cache_libs (ubuntu-22.04)	20s
cache_libs / cache_libs (macos-latest)	16s
manylinux (cp39-cp39, manylinux_2_28_x86_64)	4m 9s
manylinux (cp310-cp310, musllinux_1_2_x86_64)	4m 9s
manylinux (cp39-cp39, manylinux2014_x86_64)	4m 9s
manylinux (cp39-cp39, musllinux_1_2_x86_64)	1m 56s
manylinux (cp310-cp310, manylinux_2_28_x86_64)	1m 6s
manylinux (cp311-cp311, manylinux_2_28_x86_64)	4m 9s
manylinux (cp312-cp312, musllinux_1_2_x86_64)	4m 9s
manylinux (cp311-cp311, manylinux2014_x86_64)	3m 22s
manylinux (cp312-cp312, manylinux2014_x86_64)	1m 4s
manylinux (cp313-cp313, manylinux_2_28_x86_64)	4m 9s
manylinux (cp312-cp312, manylinux_2_28_x86_64)	4m 9s
manylinux (cp314-cp314, manylinux_2_28_x86_64)	4m 9s
manylinux (cp311-cp311, musllinux_1_2_x86_64)	4m 9s
manylinux (cp314-cp314, musllinux_1_2_x86_64)	4m 9s
manylinux (cp313-cp313, musllinux_1_2_x86_64)	2m 45s
manylinux (cp314-cp314, manylinux2014_x86_64)	4m 9s
manylinux (cp313-cp313, manylinux2014_x86_64)	4m 9s
manylinux (cp310-cp310, manylinux2014_x86_64)	4m 9s
	1h 6m 12s

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