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pdfext: do not use non-POSIX memrchr()

Reported by Dirk-Wilhelm Peters <peters@schwertfisch.de>.

--- a/pdfext.c

+++ b/pdfext.c

@@ -174,13 +174,20 @@

 	return -1;

 }

-void *memrchr(void *m, int c, long n);

+static void *my_memrchr(void *m, int c, long n)

+{

+	int i;

+	for (i = 0; i < n; i++)

+		if (*(unsigned char *) (m + n - 1 - i) == c)

+			return m + n - 1 - i;

+	return NULL;

+}

 static int prevline(char *pdf, int len, int off)

 {

-	char *nl = memrchr(pdf, '\n', off);

+	char *nl = my_memrchr(pdf, '\n', off);

 	if (nl && nl > pdf) {

-		char *nl2 = memrchr(pdf, '\n', nl - pdf -1);

+		char *nl2 = my_memrchr(pdf, '\n', nl - pdf - 1);

 		if (nl2)

 			return nl2 - pdf + 1;

 	}