Tweaks for platforms which require string.h for memxxx functions.

libs/spandsp/src/g722.c

@@ -32,6 +32,7 @@
 #include <inttypes.h>
 #include <memory.h>
 #include <stdlib.h>
+#include <string.h>
 #if defined(HAVE_TGMATH_H)
 #include <tgmath.h>
 #endif

libs/spandsp/src/gsm0610_lpc.c

@@ -43,6 +43,7 @@
 #include "floating_fudge.h"
 #include <stdlib.h>
 #include <memory.h>
+#include <string.h>
 
 #include "spandsp/telephony.h"
 #include "spandsp/fast_convert.h"

libs/spandsp/src/v8.c

@@ -33,6 +33,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <memory.h>
+#include <string.h>
 #if defined(HAVE_TGMATH_H)
 #include <tgmath.h>
 #endif