common: Add new function b64decode.
c1cd18538553
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Description

common: Add new function b64decode.

* common/b64dec.c (b64decode): New.
* common/t-b64.c: Change license to LGPL.
(oops): New macro.
(hex2buffer): New.
(test_b64decode): New.
(main): Default to run the new test.
* common/Makefile.am (module_maint_tests): Move t-b64 to ...
(module_tests): here.

Sometimes we have a short base64 encoded string we need todecode.
This function makes it simpler.

License change of the test module justified because I am the single
author of the code.