skip GTK detection if we're cross-compiling #588
Merged
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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.)