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skip GTK detection if we're cross-compiling (#588)
It seems that stlink cannot use CMake's standard mechanism to find GTK3. Cmake's GTK3 detection supports only Unix at the moment. Therefore, stlink uses pkg-config to find GTK3. The downside of this is that Cmake's cross-compiler settings are not taken into account. Even if we're cross-compiling, CMake will find a local installation of GTK3 and compilation of the GUI fails. As a simple fix, we skip the GTK3 detection if we're cross-compiling. (In the long run, we should use a more advanced mechanism to find GTK3.)
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