Fix fuzz binary compilation under windows

Author: danben

ci/test/00_setup_env_win64.sh

@@ -13,7 +13,7 @@ export DPKG_ADD_ARCH="i386"
 export PACKAGES="python3 nsis g++-mingw-w64-x86-64 wine-binfmt wine64 wine32 file"
 export RUN_FUNCTIONAL_TESTS=false
 export GOAL="deploy"
-export BITCOIN_CONFIG="--enable-reduce-exports --disable-fuzz-binary --disable-gui-tests --without-boost-process"
+export BITCOIN_CONFIG="--enable-reduce-exports --disable-gui-tests --without-boost-process"
 
 # Compiler for MinGW-w64 causes false -Wreturn-type warning.
 # See https://sourceforge.net/p/mingw-w64/bugs/306/

src/test/fuzz/fuzz.cpp

@@ -72,7 +72,7 @@ extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv)
 }
 
 #if defined(PROVIDE_MAIN_FUNCTION)
-__attribute__((weak)) int main(int argc, char** argv)
+int main(int argc, char** argv)
 {
     initialize();
     static const auto& test_one_input = *Assert(g_test_one_input);