test: merge feature/autoshield-coinbase into v1.1.0 for isolated testing

Not for release. Built solely to exercise auto-shield-coinbase on an isolated
mining chain, since the feature is a no-op on a non-mining node (the canary
seed has no balance, no z-address, no coinbase, and does not mine).

Merge is clean: util/build-win.sh auto-merged, keeping both our ARCH=default
and their -Wa,-mbig-obj. Checkpoints, verify-once guard and the version bump
all survive.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

util/build-win.sh

@@ -16,7 +16,10 @@ cd ..
 
 ./autogen.sh
 
-CONFIG_SITE=$PWD/depends/x86_64-w64-mingw32/share/config.site CXXFLAGS="-DPTW32_STATIC_LIB -DCURL_STATICLIB -fopenmp -pthread" ./configure --prefix="${PREFIX}" --host=x86_64-w64-mingw32 --enable-static --disable-shared
+# -Wa,-mbig-obj: the daemon's large template/boost-heavy TUs (e.g. asyncrpcoperation.cpp) exceed the
+# standard PE/COFF ~32k-section limit, which makes GNU ld emit "dangerous relocation" on .pdata and
+# crash. The bigobj COFF variant lifts that limit (same flag Bitcoin Core sets for the mingw host).
+CONFIG_SITE=$PWD/depends/x86_64-w64-mingw32/share/config.site CXXFLAGS="-DPTW32_STATIC_LIB -DCURL_STATICLIB -fopenmp -pthread -Wa,-mbig-obj" ./configure --prefix="${PREFIX}" --host=x86_64-w64-mingw32 --enable-static --disable-shared
 
 # Build CryptoConditions stuff
 WD=$PWD