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doom: get rid of floating point code for division

--- a/sys/src/games/doom/m_fixed.c

+++ b/sys/src/games/doom/m_fixed.c

@@ -60,21 +60,5 @@

 {

     if ( (abs(a)>>14) >= abs(b))

 	return (a^b)<0 ? MININT : MAXINT;

-    return FixedDiv2 (a,b);

-}

-

-

-

-fixed_t

-FixedDiv2

-( fixed_t	a,

-  fixed_t	b )

-{

-    double c;

-

-    c = ((double)a) / ((double)b) * FRACUNIT;

-

-    if (c >= 2147483648.0 || c < -2147483648.0)

-	I_Error("FixedDiv: divide by zero");

-    return (fixed_t) c;

+    return ((long long)a << FRACBITS) / (long long)b;

 }

--- a/sys/src/games/doom/m_fixed.h

+++ b/sys/src/games/doom/m_fixed.h

@@ -39,7 +39,6 @@

 fixed_t FixedMul	(fixed_t a, fixed_t b);

 fixed_t FixedDiv	(fixed_t a, fixed_t b);

-fixed_t FixedDiv2	(fixed_t a, fixed_t b);