Basic JIT tests are failing on s390 arches, only
Use macro for ppc64 arches
Run tests using Python2 explicitly
Simplify %%check
Use the %%{major} macro consequently
Replace %%define with %%global
Polari and gnome-shell are going to make use of it to syntax check js
files in CI. This puts it in the -devel subpackage, in line with how
Debian is packaging /usr/bin/js52 in their -dev subpackage.
