bd3f5a90ec build: remove mingw linker workaround from win gitian descriptor (fanquake)
Pull request description:
This workaround was added as part of the switch to gitian building using Ubuntu 14.04 (#6900).
However, it should no longer be required, as we have switched to Bionic (#13171) and that
has a far newer version of binutils.
Original discussion: https://github.com/bitcoin/bitcoin/pull/6900
binutils patch: https://sourceware.org/bugzilla/show_bug.cgi?id=16192
ACKs for top commit:
MarcoFalke:
ACK bd3f5a90ec
theuni:
ACK bd3f5a90ec
laanwj:
ACK bd3f5a90ec
Tree-SHA512: 01a5789994decf8cdedf7aaa0a449d2100a77e2e6b422d6b9dd5a4ac3e2e0b538c3d43aae4a1c3713614782f3c6b09d8d8bb21c20e86ce3c1734183dedd02d0c