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cc: backout gethunk() change

the real problem is that gethunk() does not grow the allocation
but just allocates a new hunk, so repeated calls to gethunk()
wont make nhunk grow to satisfy the allocation.

this will be fixed in a upcoming commit.

--- a/sys/src/cmd/cc/macbody

+++ b/sys/src/cmd/cc/macbody

@@ -854,16 +854,9 @@

 	char *h;

 	long nh;

-	if(thunk >= 100L*NHUNK)

-		nh = 100L*NHUNK;

-	else if(thunk >= 50L*NHUNK)

-		nh = 50L*NHUNK;

-	else if(thunk >= 25L*NHUNK)

-		nh = 25L*NHUNK;

-	else if(thunk >= 10L*NHUNK)

+	nh = NHUNK;

+	if(thunk >= 10L*NHUNK)

 		nh = 10L*NHUNK;

-	else

-		nh = NHUNK;

 	h = (char*)mysbrk(nh);

 	if(h == (char*)-1) {

 		yyerror("out of memory");