Fix GCC 8 memset warning and set -Werror only for debug builds #1612
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Description
Resolves #1558 by overwriting the KeePassHTTP password string without the use of memset() and enabling -Werror only for debug builds.
Motivation and context
GCC 8 issued a warning about use of memset for non-trivial type QChar.
How has this been tested?
I don't have GCC 8, so I could only test with GCC 7.2 that everything continues to work.
Types of changes
Checklist:
-DWITH_ASAN=ON
. [REQUIRED]