polyglossia v1.3 causes babel patching error

[plk]

It seems that polyglossia v1.3 no longer defines \select@language and so a babel patch command in biblatex gives an error as this is what it tries to patch. It is supposed to patch only when babel is loaded but since babel hyphenation patterns seem to be loaded anyway, even if using polyglossia perhaps this test succeeds when only polyglossia is loaded and we never noticed since the patching always used to work? Probably need to check for polyglossia and not patch if so.

[plk]

Seems that polyglossia v1.3 does define \select@language but it's no longer patchable because it uses \csname plus lot of other catcode chars due to a directlua call. Hmm.

[plk]

2.7 DEV version now has changed babel patching code to detect this and patches \select@@language instead if it's defined (which it is in polyglossia). This is called inside select@language just after an init routine which doesn't do much so it should be ok.