MD: Make deprecated functions not inline

In 2.7.0, we replaced a number of MD functions with deprecated inline
versions. This causes ABI compatibility issues, as the functions are no
longer guaranteed to be callable when built into a shared library.
Instead, deprecate the functions without also inlining them, to help
maintain ABI backwards compatibility.
diff --git a/library/md5.c b/library/md5.c
index 8872dc4..8440ebf 100644
--- a/library/md5.c
+++ b/library/md5.c
@@ -110,6 +110,13 @@
     return( 0 );
 }
 
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+void mbedtls_md5_starts( mbedtls_md5_context *ctx )
+{
+    mbedtls_md5_starts_ret( ctx );
+}
+#endif
+
 #if !defined(MBEDTLS_MD5_PROCESS_ALT)
 int mbedtls_internal_md5_process( mbedtls_md5_context *ctx,
                                   const unsigned char data[64] )
@@ -236,6 +243,14 @@
 
     return( 0 );
 }
+
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+void mbedtls_md5_process( mbedtls_md5_context *ctx,
+                          const unsigned char data[64] )
+{
+    mbedtls_internal_md5_process( ctx, data );
+}
+#endif
 #endif /* !MBEDTLS_MD5_PROCESS_ALT */
 
 /*
@@ -289,6 +304,15 @@
     return( 0 );
 }
 
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+void mbedtls_md5_update( mbedtls_md5_context *ctx,
+                         const unsigned char *input,
+                         size_t ilen )
+{
+    mbedtls_md5_update_ret( ctx, input, ilen );
+}
+#endif
+
 static const unsigned char md5_padding[64] =
 {
  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
@@ -332,6 +356,14 @@
     return( 0 );
 }
 
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+void mbedtls_md5_finish( mbedtls_md5_context *ctx,
+                         unsigned char output[16] )
+{
+    mbedtls_md5_finish_ret( ctx, output );
+}
+#endif
+
 #endif /* !MBEDTLS_MD5_ALT */
 
 /*
@@ -361,6 +393,15 @@
     return( ret );
 }
 
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+void mbedtls_md5( const unsigned char *input,
+                  size_t ilen,
+                  unsigned char output[16] )
+{
+    mbedtls_md5_ret( input, ilen, output );
+}
+#endif
+
 #if defined(MBEDTLS_SELF_TEST)
 /*
  * RFC 1321 test vectors