gtkdochelper.py: Ignore UnicodeEncodeError when printing output
gtkdochelper.py: Ignore UnicodeEncodeError when printing output

Windows cmd.exe consoles may be using a code page that might choke
print() when we are outputting the output from calling gtk-doc.  Let's
just ignore the error when it happens and print as much as we could in
this situation.

becm/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson,QuLogic/meson,becm/meson,mesonbuild/meson,jpakkane/meson,mesonbuild/meson,becm/meson,QuLogic/meson,becm/meson,mesonbuild/meson,jpakkane/meson,pexip/meson,pexip/meson,becm/meson,QuLogic/meson,jpakkane/meson,mesonbuild/meson,becm/meson,pexip/meson,QuLogic/meson,becm/meson,pexip/meson,QuLogic/meson,becm/meson,QuLogic/meson,becm/meson,pexip/meson,mesonbuild/meson,jpakkane/meson,jpakkane/meson,mesonbuild/meson,pexip/meson,jpakkane/meson,QuLogic/meson,QuLogic/meson,jpakkane/meson,QuLogic/meson,pexip/meson,jpakkane/meson,mesonbuild/meson,pexip/meson,becm/meson,jpakkane/meson,mesonbuild/meson,pexip/meson