Fix issues in TLS Extension size calculations #4053

Job	Run time
build library (--enable-intelasm --enable-sp-asm --enable-experimental --enable-kyber=yes,origina...	46s
build library (--enable-intelasm --enable-sp-asm)	30s
build library (--disable-asm)	28s
build library (--enable-intelasm --enable-sp-asm --enable-all-crypto --enable-experimental --enab...	48s
build library (--disable-asm --enable-all-crypto --enable-experimental --enable-kyber=yes,origina...	47s
build library (--disable-asm --enable-experimental --enable-kyber=yes,original --enable-lms --ena...	37s
	3m 56s

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