Fixed installation of yarp_sig header files

[randaz81]

Added install of header files generated by thtift in yarp_sig

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would update the release notes by adding a file in doc/release/<target_branch>, based on your changes.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +28.12%	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (9e4dfb7)	538869	140607	26.09%
Head commit (a53da60)	113284 (-425585)	61418 (-79189)	54.22% (+28.12%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#3137)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[PeterBowman]

yarp/src/libYARP_sig/src/CMakeLists.txt

Line 192 in a53da60

set_property(TARGET YARP_sig PROPERTY PRIVATE_HEADER ${YARP_sig_IMPL_HDRS})

@randaz81 shouldn't we also install private IDL headers, as in YARP_dev?

set_property(TARGET YARP_sig PROPERTY PRIVATE_HEADER ${YARP_sig_IMPL_HDRS} ${YARP_sig_idl_IMPL_HDRS}) 

[PeterBowman]

Would it be OK if I open a PR to patch this? It doesn't seem to cause trouble now, but I believe it might explode at some point later, and such tiny things are prone to being hard to debug.

Edit: see #3142.