Update Mbed Crypto SO version
The recent update changed the Mbed Crypto SO version, get Mbed TLS in
sync.
@@ -37,7 +37,7 @@ endif
SOEXT_TLS=so.13
SOEXT_X509=so.1
-SOEXT_CRYPTO=so.3
+SOEXT_CRYPTO=so.4
# Set AR_DASH= (empty string) to use an ar implementation that does not accept
# the - prefix for command line options (e.g. llvm-ar)
