yosys-filterlib misformats string values

[povik]

Version

Yosys 0.46+124 (git sha1 8c2d1a1, clang++ 11.1.0 -fPIC -O3)

On which OS did this happen?

macOS

Reproduction Steps

Run yosys-filterlib on a .lib file containing a string-valued attribute, and use a rule set which doesn't filter said attribute away.

e.g.

	date            : "Wed Feb 22 14:30:32 2023" ;
	comment         : "IHP Microelectronics GmbH, 2023" ;

Expected Behavior

The attribute roundtrips into parsable Liberty text

Actual Behavior

  date : Wed Feb 22 14:30:32 2023 ;
  comment : IHP Microelectronics GmbH, 2023 ;