bpo-7938: the makesetup script now respects macro define arguments of…

[michaelgrahamevans]

… the form '-Dname=definition'

Previously adding a macro define argument in the Modules/Setup file such as '-Dname=value' was recognised by the makesetup script as a Make variable definition due to the '=' character. This change uses sed to find lines with only one token to the left of the first '=' which it treats as a Make variable definition. Lines not matching this criteria are matched as module definitions. Moreover, this change respects Make variable definitions with '=', ':=', '::=', '+=' and '?=' syntax.

https://bugs.python.org/issue7938

[the-knights-who-say-ni]

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[michaelgrahamevans]

I have signed the CLA.

[benjaminp]

I wonder if we can simplify this by assuming the make variables are of the form ^SOME_VAR=? (i.e., one word at the beginning of a line).