Abort on line numbering or column numbering overflow. Line numbers are limited to values that fit in "unsigned int". Also reject input lines longer than 2^32-1 characters. It seems reasonable to presume that any input that violates these constraints is someone screwing around and not a serious attempt to compile or preprocess anything useful. Done in response to n2129, but without getting into any of the silliness found there.

--- a/main.c	Thu Dec 15 23:53:13 2016 -0500
+++ b/main.c	Tue Aug 01 14:51:04 2017 -0400
@@ -155,7 +155,7 @@
 
 	if (val) {
 		p2 = *p;
-		p2.column += strlen(str);
+		place_addcolumns(&p2, strlen(str));
 	} else {
 		place_setbuiltin(&p2, 1);
 	}