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Check for RPN stack overflow in linker

--- a/src/link/patch.c

+++ b/src/link/patch.c

@@ -18,13 +18,18 @@

 #include "link/mylink.h"

 #include "link/symbol.h"

+#define RPN_STACK_SIZE 256

+

 static struct sSection *pCurrentSection;

-static int32_t rpnstack[256];

+static int32_t rpnstack[RPN_STACK_SIZE];

 static int32_t rpnp;

 int32_t nPC;

 static void rpnpush(int32_t i)

 {

+	if (rpnp >= RPN_STACK_SIZE)

+		errx(1, "RPN stack overflow");

+

 	rpnstack[rpnp] = i;

 	rpnp++;

 }