Fix typo

Author: fxcoudert

stdlib/OpenSSL_jll/src/OpenSSL_jll.jl

@@ -16,8 +16,8 @@ const LIBPATH = Ref("")
 artifact_dir::String = ""
 libcrypto_handle::Ptr{Cvoid} = C_NULL
 libcrypto_path::String = ""
-libmssl_handle::Ptr{Cvoid} = C_NULL
-libmssl_path::String = ""
+libssl_handle::Ptr{Cvoid} = C_NULL
+libssl_path::String = ""
 
 if Sys.iswindows()
     const libcrypto = "libcrypto.dll"