Merge pull request #4635 from Patater/mbed-can-do-timing-2.x

Backport 2.x: config: Allow Mbed to implement TIMING_C

Trivial backport, only one reviewer is ok.
diff --git a/ChangeLog.d/mbed-can-do-timing.txt b/ChangeLog.d/mbed-can-do-timing.txt
new file mode 100644
index 0000000..d83da02
--- /dev/null
+++ b/ChangeLog.d/mbed-can-do-timing.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * Remove outdated check-config.h check that prevented implementing the
+     timing module on Mbed OS. Fixes #4633.
diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index a6545ab..ce25bd0 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -55,9 +55,8 @@
 #endif
 #endif /* _WIN32 */
 
-#if defined(TARGET_LIKE_MBED) && \
-    ( defined(MBEDTLS_NET_C) || defined(MBEDTLS_TIMING_C) )
-#error "The NET and TIMING modules are not available for mbed OS - please use the network and timing functions provided by mbed OS"
+#if defined(TARGET_LIKE_MBED) && defined(MBEDTLS_NET_C)
+#error "The NET module is not available for mbed OS - please use the network functions provided by Mbed OS"
 #endif
 
 #if defined(MBEDTLS_DEPRECATED_WARNING) && \