mingw32-gtk2-engines from windows:mingw:win32 project

需要 openSUSE Tumbleweed ARM ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/windows:mingw:win32/openSUSE_Tumbleweed_ARM/windows:mingw:win32.repo
zypper refresh
zypper install mingw32-gtk2-engines

需要 openSUSE Tumbleweed ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/windows:mingw:win32/openSUSE_Tumbleweed/windows:mingw:win32.repo
zypper refresh
zypper install mingw32-gtk2-engines

需要 openSUSE Leap 15.6 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/windows:mingw:win32/openSUSE_Leap_15.6/windows:mingw:win32.repo
zypper refresh
zypper install mingw32-gtk2-engines

需要 openSUSE Leap 16.0 ，用 root 執行：

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