scalar-crypto: release rc4

 On branch master
 Your branch is up-to-date with 'origin/master'.

 Changes to be committed:
	modified:   insns/aes32dsi.adoc
	modified:   insns/aes32dsmi.adoc
	modified:   insns/aes32esi.adoc
	modified:   insns/aes32esmi.adoc
	modified:   insns/aes64ds.adoc
	modified:   insns/aes64dsm.adoc
	modified:   insns/aes64es.adoc
	modified:   insns/aes64esm.adoc
	modified:   insns/aes64im.adoc
	modified:   insns/aes64ks1i.adoc
	modified:   insns/aes64ks2.adoc
	modified:   insns/sha256sig0.adoc
	modified:   insns/sha256sig1.adoc
	modified:   insns/sha256sum0.adoc
	modified:   insns/sha256sum1.adoc
	modified:   insns/sha512sig0.adoc
	modified:   insns/sha512sig0h.adoc
	modified:   insns/sha512sig0l.adoc
	modified:   insns/sha512sig1.adoc
	modified:   insns/sha512sig1h.adoc
	modified:   insns/sha512sig1l.adoc
	modified:   insns/sha512sum0.adoc
	modified:   insns/sha512sum0r.adoc
	modified:   insns/sha512sum1.adoc
	modified:   insns/sha512sum1r.adoc
	modified:   insns/sm3p0.adoc
	modified:   insns/sm3p1.adoc
	modified:   insns/sm4ed.adoc
	modified:   insns/sm4ks.adoc
	modified:   riscv-crypto-spec-scalar.adoc
	modified:   ../../extern/riscv-bitmanip

 Changes not staged for commit:
	modified:   ../../extern/riscv-gnu-toolchain (modified content)
	modified:   ../../extern/sail-riscv (untracked content)