Configurations: Identify the shell variables around MANSUFFIX

With MANSUFFIX=A the statement '$$fn$(MANSUFFIX)' is reaplaces with
'$fnA' and left empty because the `fnA' variables is not recognized
within the shell.

With {} around fn it is then bocomes ${fn}A and works as expected.
While here, add the MANSUFFIX to the ECHO line so it is properly printed
during build.

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11643)

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