1.270:
As an effect of revisions 1.261, BUILD_CMD was changed so $(DIRS)
wasn't respected when using it to build different parts of OpenSSL.
1.269 was an attempt to correct that, but unfortunately meant that we
built every part that was given i $(DIRS) 7 times.  This change puts
back the original intent with BUILD_CMD via the new macro
BUILD_ONE_CMD while keeping the intent with RECURSIVE_BUILD_CMD.

1.271:
Document the building macros.

Submitted by: Girish Venkatachalam <girish1729@gmail.com>

correctly encode FALSE for BOOL in ASN1_TYPE.

PR: 1217

Submitted by: Austin Ziegler <halostatue@gmail.com>

PR: 1270

PR: 1266

because the Compaq C compiler will not accept that a variable be
declared extern then defined static without a warning.

"make error".

Change assignment strategy: rathern than using max+r for new codes,
find first hole in list of existing codes.

it's still possible to do a partial build.

(Problem reported by Peter Sylvester.)

PR: 1247
Submitted by: Doug Kaufman

PR: 1247