bug#28286: sh-script package has incorrect syntax highlighting when shell type is set to rpm

[Andrew Toskin]

On Wed, 2017-08-30 at 16:30 -0400, Glenn Morris wrote:

> sh-script.el's support for RPM spec files is _extremely_ basic.

> There is a dedicated rpm-spec-mode.el distributed separately that you

> might prefer.

Sure, but if sh-script mode is going to support the syntax at all, it should at least be correct, right? When the spec file's %description section has an odd number of apostrophes, the "string" highlight gobbles up the rest of the file unless or until it meets another apostrophe somewhere.