mbedtls: upgrade to 2.24.0

Download archives are no longer updated so fetch from Github. Add build
fix from upstream. The file LICENSE now contains the full Apache 2.0
license text.

Signed-off-by: Alexander Vickberg <wickbergster@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-networking/recipes-connectivity/mbedtls/mbedtls/fix-incorrect-EOF-check-in-ssl_context_info.patch

@@ -0,0 +1,57 @@
+From d696e7d91e42a190d06760279d2e396392143454 Mon Sep 17 00:00:00 2001
+From: Nayna Jain <nayna@linux.ibm.com>
+Date: Thu, 13 Aug 2020 19:17:53 +0000
+Subject: [PATCH] programs/ssl: Fix incorrect EOF check in ssl_context_info.c
+
+In `read_next_b64_code()`, the result of fgetc() is stored into a char,
+but later compared against EOF, which is generally -1.  On platforms
+where char is unsigned, this generates a compiler warning/error that the
+comparison will never be true (causing a build failure).  The value will
+never match, with the function ultimately bailing with a "Too many bad
+symbols are detected" error.
+
+On platforms with signed char, EOF is detected, but a file containing a
+0xFF character will causes a premature end of file exit of the loop.
+
+Fix this by changing the result to an int.
+
+Fixes #3794.
+
+Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
+Signed-off-by: David Brown <david.brown@linaro.org>
+---
+ ChangeLog.d/bugfix_3794.txt     | 4 ++++
+ programs/ssl/ssl_context_info.c | 4 ++--
+ 2 files changed, 6 insertions(+), 2 deletions(-)
+ create mode 100644 ChangeLog.d/bugfix_3794.txt
+
+diff --git a/ChangeLog.d/bugfix_3794.txt b/ChangeLog.d/bugfix_3794.txt
+new file mode 100644
+index 0000000000..a483ea76ae
+--- /dev/null
++++ b/ChangeLog.d/bugfix_3794.txt
+@@ -0,0 +1,4 @@
++Bugfix
++  * Fix handling of EOF against 0xff bytes and on platforms with
++    unsigned chars.  Fixes a build failure on platforms where char is
++    unsigned.  Fixes #3794.
+diff --git a/programs/ssl/ssl_context_info.c b/programs/ssl/ssl_context_info.c
+index df8819a804..d109c1e6f7 100644
+--- a/programs/ssl/ssl_context_info.c
++++ b/programs/ssl/ssl_context_info.c
+@@ -377,13 +377,13 @@ size_t read_next_b64_code( uint8_t **b64, size_t *max_len )
+     int valid_balance = 0;  /* balance between valid and invalid characters */
+     size_t len = 0;
+     char pad = 0;
+-    char c = 0;
++    int c = 0;
+ 
+     while( EOF != c )
+     {
+         char c_valid = 0;
+ 
+-        c = (char) fgetc( b64_file );
++        c = fgetc( b64_file );
+ 
+         if( pad > 0 )
+         {

meta-networking/recipes-connectivity/mbedtls/mbedtls_2.24.0.bb

@@ -18,13 +18,15 @@ understand what the code does. It features:                          \
 HOMEPAGE = "https://tls.mbed.org/"
 
 LICENSE = "Apache-2.0"
-LIC_FILES_CHKSUM = "file://LICENSE;md5=302d50a6369f5f22efdb674db908167a"
+LIC_FILES_CHKSUM = "file://LICENSE;md5=3b83ef96387f14655fc854ddc3c6bd57"
 
 SECTION = "libs"
 
-SRC_URI = "https://tls.mbed.org/download/mbedtls-${PV}-apache.tgz"
-SRC_URI[md5sum] = "1f629a43c166de2eca808f3e30aa961d"
-SRC_URI[sha256sum] = "66455e23a6190a30142cdc1113f7418158839331a9d8e6b0778631d077281770"
+S = "${WORKDIR}/git"
+SRCREV = "523f0554b6cdc7ace5d360885c3f5bbcc73ec0e8"
+SRC_URI = "git://github.com/ARMmbed/mbedtls.git;protocol=https;branch=development \
+           file://fix-incorrect-EOF-check-in-ssl_context_info.patch \
+"
 
 inherit cmake