Fix unused variable/function compilation warnings
This PR fixes a number of unused variable/function compilation warnings
that arise when using a config.h that does not define the macro
MBEDTLS_PEM_PARSE_C.
diff --git a/ChangeLog b/ChangeLog
index 92d7977..bbe1329 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
mbed TLS ChangeLog (Sorted per branch, date)
+= mbed TLS x.x.x branch released xxxx-xx-xx
+
+Bugfix
+ * Fix unused variable/function compilation warnings in pem.c and x509_csr.c
+ that are reported when building mbed TLS with a config.h that does not
+ define MBEDTLS_PEM_PARSE_C. #562
+
= mbed TLS 2.1.6 branch released 2016-10-17
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