semarie c4fff7fdf2 devel/cargo module: add few more C source removing from crates
expat-sys, freetype-sys and servo-fontconfig-sys are embedding C source directories.
remove them to ensure system-libs are used.

found while reviewing alacritty crates.
no changes for alacritty as system-libs were already used.
2021-11-15 07:44:37 +00:00
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