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/md4.c b/library/md4.c
index 34a4b0e..ba704f5 100644
--- a/library/md4.c
+++ b/library/md4.c
@@ -111,6 +111,13 @@
     return( 0 );
 }
 
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+void mbedtls_md4_starts( mbedtls_md4_context *ctx )
+{
+    mbedtls_md4_starts_ret( ctx );
+}
+#endif
+
 #if !defined(MBEDTLS_MD4_PROCESS_ALT)
 int mbedtls_internal_md4_process( mbedtls_md4_context *ctx,
                                   const unsigned char data[64] )
@@ -217,6 +224,14 @@
 
     return( 0 );
 }
+
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+void mbedtls_md4_process( mbedtls_md4_context *ctx,
+                          const unsigned char data[64] )
+{
+    mbedtls_internal_md4_process( ctx, data );
+}
+#endif
 #endif /* !MBEDTLS_MD4_PROCESS_ALT */
 
 /*
@@ -273,6 +288,15 @@
     return( 0 );
 }
 
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+void mbedtls_md4_update( mbedtls_md4_context *ctx,
+                         const unsigned char *input,
+                         size_t ilen )
+{
+    mbedtls_md4_update_ret( ctx, input, ilen );
+}
+#endif
+
 static const unsigned char md4_padding[64] =
 {
  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
@@ -318,6 +342,14 @@
     return( 0 );
 }
 
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+void mbedtls_md4_finish( mbedtls_md4_context *ctx,
+                         unsigned char output[16] )
+{
+    mbedtls_md4_finish_ret( ctx, output );
+}
+#endif
+
 #endif /* !MBEDTLS_MD4_ALT */
 
 /*
@@ -347,6 +379,15 @@
     return( ret );
 }
 
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+void mbedtls_md4( const unsigned char *input,
+                  size_t ilen,
+                  unsigned char output[16] )
+{
+    mbedtls_md4_ret( input, ilen, output );
+}
+#endif
+
 #if defined(MBEDTLS_SELF_TEST)
 
 /*