package/agec: new package

Agec is a simple file encryption tool that implements the
age format in C with minimal dependencies. The tool supports
asymmetric encryption based on X25519, and a passphrase
encryption based on scrypt.

https://git.sr.ht/~min/agec
https://age-encryption.org

Encryption is silently broken for files <35 bytes, so add a patch submitted
upstream to fix that.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -2649,6 +2649,7 @@ F:	configs/orangepi_pc_defconfig
 F:	configs/orangepi_r1_defconfig
 F:	configs/sheevaplug_defconfig
 F:	configs/visionfive_defconfig
+F:	package/agec/
 F:	package/bats-core/
 F:	package/dfu-programmer/
 F:	package/docker-compose/
@@ -2683,6 +2684,7 @@ F:	package/triggerhappy/
 F:	package/ugetty/
 F:	package/wireguard-linux-compat/
 F:	package/wireguard-tools/
+F:	support/testing/tests/package/test_agec.py
 F:	support/testing/tests/package/test_docker_compose.py
 F:	support/testing/tests/package/test_python_hid.py