Improve comments around startup_hacks() code.

These comments were not updated when we added the EXEC_BACKEND
mechanism for Windows, even though it rendered them inaccurate.

Also unify two unnecessarily-separate #ifdef __alpha code blocks.

Branch
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master

Details
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http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=14ed7735f5bb5275da13891c4bb106c198d00b53

Modified Files
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src/backend/main/main.c |   45 ++++++++++++++++++++++++---------------------
1 files changed, 24 insertions(+), 21 deletions(-)

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Next:	From: Robert Haas	Date: 2010-12-17 01:58:03
	Subject: pgsql: Waiting for complete startup is now a well-defined operation.
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	Subject: pgsql: Remove optreset from src/port/ implementations of getopt andget