Backport 1.3:Add configuration file in md.h

include *`config.h`* in md.h as MACROS in the header file get ignored.Backport to
Backport of #1055 to mbedtls-1.3
diff --git a/ChangeLog b/ChangeLog
index a3171d7..cd7fc41 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 mbed TLS ChangeLog (Sorted per branch, date)
 
+= mbed TLS x.x.xx branch released xxxx-xx-xx
+
+Bugfix
+    * Include configuration file in md.h, to fix compilation warnings.
+      Reported by aaronmdjones in #1001
+
 = mbed TLS 1.3.21 branch released 2017-08-10
 
 Security