bootstrap: avoid m4 -B for NetBSD-built sparc64 OpenSSL
bootstrap: avoid m4 -B for NetBSD-built sparc64 OpenSSL

GBGamer/rust,GBGamer/rust,graydon/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,graydon/rust,GBGamer/rust,aidancully/rust,aidancully/rust,aidancully/rust,GBGamer/rust,graydon/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust