debug: add some code to time the performance of get_totsize()

Don't activate this by passing --enable-debug.  Just remove the
relevant #ifdefs when you want to test the performance of changes
in the counting code.

src/nano.c

@@ -465,8 +465,15 @@ void ingraft_buffer(filestruct *somebuffer)
 	}
 #endif
 
+#ifdef DEBUG
+#include <time.h>
+	clock_t start = clock();
+#endif
 	/* Add the number of characters in the copied text to the file size. */
 	openfile->totsize += get_totsize(openfile->fileage, openfile->filebot);
+#ifdef DEBUG
+	statusline(ALERT, "Took: %.2f", (double)(clock() - start) / CLOCKS_PER_SEC);
+#endif
 
 	/* If we pasted onto the first line of the edit window, the corresponding
 	 * struct has been freed, so... point at the start of the copied text. */