Avoid mingw's default manifest

.appveyor.yml

@@ -70,6 +70,10 @@ install:
   - ps: 'Start-FileDownload "http://cygwin.com/setup-x86_64.exe" -FileName "setup-x86_64.exe"'
   - '%CYG_SETUP% -dgnqNO -R "%CYG_ROOT%" -s "%CYG_MIRROR%" -l "%CYG_ROOT%\var\cache\setup" -P mingw64-%MINGW_ARCH%-gcc-core,mingw64-%MINGW_ARCH%-gcc-g++,mingw64-%MINGW_ARCH%-headers,mingw64-%MINGW_ARCH%-runtime,zip,mingw64-%MINGW_ARCH%-clang,libiconv-devel,libglib2.0-devel,perl,mingw64-%MINGW_ARCH%-zlib,cmake,mingw64-%MINGW_ARCH%-win-iconv'
 
+# Mingw has a default embedded manifest now, which is poisonous, but we cannot uninstall because the package is a hard dependency.
+# Absence of the file is ok tho.
+#  - '%CYG_SETUP% -dgnqNO -R "%CYG_ROOT%" -s "%CYG_MIRROR%" -l "%CYG_ROOT%\var\cache\setup" -x mingw64-%MINGW_ARCH%-windows-default-manifest'
+
 build: false
 
 # Cygwin build script

.travis_build.sh

@@ -17,6 +17,10 @@ if [[ "${APPVEYOR}" ]]; then
     echo
     test -d /usr/i686-w64-mingw32/sys-root/mingw/lib || echo "No lib dir"
     test -d /usr/i686-w64-mingw32/sys-root/mingw/include || echo "No inc dir"
+
+    # Mingw has a default embedded manifest now, which is poisonous.
+    # Absence of the file is ok tho.
+    rm -f /usr/i686-w64-mingw32/sys-root/mingw/lib/default-manifest.o || true
 else
     PLATFORM="${TRAVIS_OS_NAME}"
 fi