geo_ops.c is broken

The recently checked-in backend/utils/adt/geo_ops.c does not compile
under gcc 2.7.2.2,
Backing out the #define LINEDEBUG makes it compile, but who checked
this stuff in anyway?

Probably t'was moi. Will look at it, though I'm suprised that a #define
LINEDEBUG was in the code. I _always_ do that from the Makefile. I had
gotten some patches from Gautam Thaker which addressed a boundary
problem in one of the routines, and something funny must have crept in.
I'm not sure what went wrong considering that I took a (fairly) fresh
source and passed the regression tests with it...

Sorry to slow you up on testing int8 and type conversion stuff :)

- Tom

Looks like they are gone now.

The recently checked-in backend/utils/adt/geo_ops.c does not compile
under gcc 2.7.2.2, because it has

#define LINEDEBUG

followed by several instances of

#if LINEDEBUG

... in other words #if with an empty expression, which I think gcc
has every right to object to. Either the #if's ought to be #ifdef's
or LINEDEBUG has to be #define'd as 1 rather than empty.

I changed the #if's to #ifdef's and found that it *still* doesn't
compile, because the code within the if's is seriously broken ---
it's got lines like
result->C = pt1->x;
where result is a char * and pt1 isn't even declared.

Backing out the #define LINEDEBUG makes it compile, but who checked
this stuff in anyway?

grumble, tom lane

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