pgcrypto: Fix incorrect argument vs PG_GETARG*() mappings

The following functions use a mix of bytea and text arguments, but their
C internals always used PG_GETARG_BYTEA_PP(), creating an incorrect mix
with the argument types expected by encrypt_internal():
- pgp_sym_encrypt_bytea(bytea,text[,text])
- pgp_sym_encrypt(text,text[,text])
- pgp_sym_decrypt_bytea(bytea,text[,text])
- pgp_sym_decrypt(bytea,text[,text])
- pgp_pub_encrypt_bytea(bytea,bytea[,text])
- pgp_pub_encrypt(text,bytea[,text])
- pgp_pub_decrypt_bytea(bytea, bytea[,text[,text]])
- pgp_pub_decrypt(bytea,bytea[,text[,text]])

This commit fixes the inconsistencies between the PG_GETARG*() macros
and the argument types of each function.

Both BYTEA_PP() and TEXT_PP() rely on PG_DETOAST_DATUM_PACKED(), that
returns an unaligned pointer, so this was not leading to an actual
problem as far as I know, but let's be consistent.

Author: Shihao Zhong
Discussion: 
https://postgr.es/m/CAGRkXqRfiWT--DzVPx_UGpNHTt0YT5Jo8eV2CtT56jNP=qp...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/d0071f922808981e2371351c46da5bb3c49554b2

Modified Files
--------------
contrib/pgcrypto/pgp-pgsql.c | 58 ++++++++++++++++++++++----------------------
1 file changed, 29 insertions(+), 29 deletions(-)

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