All the other files in the repo which include bitcoin-config.h do so with the appropriate subfolder prefixed: config/bitcoin-config.h
The header should be included with the appropriate subfolder here as well.
This canonicalization also allows getting rid of a bit of extra configuration in Makefile.am.
python3 is required for running the unit tests on macOS, Ubuntu and Fedora.
Without python3 installed, 'make check' fails because /test/util/bitcoin-util-test.py fails to find python3.
In this test, `nTime` is used for all the calls to `Mine()`, each time being set to the correct time beforehand, except for in the last few calls to `Mine()` where `nStartTime` is used directly, even though `nTime` is still set to `nStartTime` beforehand. `nTime` just remains unused for these last few calls to `Mine()`.
Changed the last few calls to `Mine()` to use `nTime` instead, improving consistency. This also fixes an unused value static analyzer warning about `nTime` being set to a value which is never used.
Simplify bswap_16 implementation on platforms which don't already have it defined.
This has no effect on the generated assembly; it just simplifies the source code.