Move from inttypes.h to stdint.h

Some toolchains do not have inttypes.h, and we only need stdint.h which is a
subset of it.

library/base64.c

@@ -34,7 +34,7 @@
 #include <basetsd.h>
 typedef UINT32 uint32_t;
 #else
-#include <inttypes.h>
+#include <stdint.h>
 #endif
 
 #if defined(MBEDTLS_SELF_TEST)

library/net.c

@@ -83,7 +83,7 @@ static int wsa_init_done = 0;
 #include <basetsd.h>
 typedef UINT32 uint32_t;
 #else
-#include <inttypes.h>
+#include <stdint.h>
 #endif
 
 #if defined(MBEDTLS_PLATFORM_C)

library/ssl_cli.c

@@ -46,7 +46,7 @@
 #include <basetsd.h>
 typedef UINT32 uint32_t;
 #else
-#include <inttypes.h>
+#include <stdint.h>
 #endif
 
 #if defined(MBEDTLS_HAVE_TIME)

tests/suites/helpers.function

@@ -16,7 +16,7 @@
 #include <basetsd.h>
 typedef UINT32 uint32_t;
 #else
-#include <inttypes.h>
+#include <stdint.h>
 #endif
 
 #include <stdio.h>