Wdeclaration-after-statement fixes #4055

Job	Run time
build library (--enable-intelasm --enable-sp-asm --enable-experimental --enable-kyber=yes,origina...	34s
build library (--enable-intelasm --enable-sp-asm)	47s
build library (--enable-intelasm --enable-sp-asm --enable-all-crypto --enable-experimental --enab...	47s
build library (--disable-asm --enable-all-crypto --enable-experimental --enable-kyber=yes,origina...	54s
build library (--disable-asm --enable-experimental --enable-kyber=yes,original --enable-lms --ena...	43s
build library (--disable-asm)	28s
	4m 13s

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