Bug#644086: libmozjs-dev: Missing headers

[Josselin Mouette]

Package: libmozjs-dev
Version: 7.0.1-1
Severity: grave
Justification: renders package unusable

Looks like #637984 is back from the dead.

For example for gjs:
In file included from /usr/include/mozjs/jscntxt.h:51:0,
                 from gjs/jsapi-private.cpp:35:
/usr/include/mozjs/jsatom.h:53:23: fatal error: vm/String.h: No such file or directory
compilation terminated.

-- 
 .''`.      Josselin Mouette
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