fix(freetype): 补 ftsynth.c —— 合成粗体/斜体 #996

Job	Run time
select	11s
lint	13s
graphics install: no side effects on unrelated members	3m 30s
mirror-cn-reachable	12s
workspace (windows default 0/1)	3m 51s
workspace (macos default 0/1)	2m 25s
workspace (linux llvm 0/1)	4m 18s
workspace (linux default 0/1)	4m 13s
timings	4s
full sweep failed — open an issue	0s
	18m 57s

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