libgcrypt was updated to 1.5.3 [bnc#831359] to fix
a security issue, bugs and get some new features:

Security issue fixed:
* Mitigate the Yarom/Falkner flush+reload side-channel attack on
RSA secret keys. See .

- contains changes from 1.5.2
* The upstream sources now contain the IDEA algorithm, dropping:
idea.c.gz
libgcrypt-1.5.0-idea.patch
libgcrypt-1.5.0-idea_codecleanup.patch
* Made the Padlock code work again (regression since 1.5.0).
* Fixed alignment problems for Serpent.
* Fixed two bugs in ECC computations.
- add GPL3.0+ to License tag because of dumpsexp (bnc#810759)
- contains changes from 1.5.1
* Allow empty passphrase with PBKDF2.
* Do not abort on an invalid algorithm number in
gcry_cipher_get_algo_keylen and gcry_cipher_get_algo_blklen.
* Fixed some Valgrind warnings.
* Fixed a problem with select and high fd numbers.
* Improved the build system
* Various minor bug fixes.
* Interface changes relative to the 1.5.0 release:
GCRYCTL_SET_ENFORCED_FIPS_FLAG NEW.
GCRYPT_VERSION_NUMBER NEW.