Shrink Vectorize buffer and use MemoryMgr calls

This lets the build run in Mini vMac (8 MB Mac II). For some reason, calloc can't create buffers as large as NewPtr.

Tools/ToolSource/Vectorize.c

@@ -403,11 +403,13 @@ int main(int argc, char **argv)
 	}
 
 	dest.buf = dest.at = calloc(0x400000, 1);
+	dest.buf = dest.at = NewPtr(0x100000);
 	if(!dest.buf)
 	{
 		fprintf(stderr, ERRSTR "Failed to calloc 4MB dest buffer\n");
 		return 1;
 	}
+	memset(dest.buf, 0, 0x100000);
 
 	/* Create a First record (remember that MPW objects are fully ascending) */
 	dest.at[0] = 1;