Relax template matching rules for std::bind and GNU C++ >= 7.1

[esteve]

Connects to #479

[esteve]

@dhood this should fix #479 , but unfortunately I don't have the entire workspace ready right now to build map_server or the Turtlebot demo, the test I added in test_function_traits.cpp should cover that case.

[mikaelarguedas]

Thanks @esteve !

I tested this patch in a tb2 workspace on bionic and it does fix the compilation error 👍

[mikaelarguedas]

CI:

• Linux

• Linux-aarch64

• macOS

• Windows

• TB2 demo xenial

• TB2 demo bionic

[esteve]

@mikaelarguedas no worries, let me know if there's anything else that needs to be fixed/improved.

@dhood I just noticed that you had submitted #480 to highlight #479. Sorry, I hadn't seen it before submitting this PR. I believe 9d5b035#diff-36b58065fa9e8269e336f296c41cdf4cR125 should pass now 🤞

[dhood]

No worries, thanks for taking a look at it!

[esteve]

@dhood anytime! :-) Feel free to ping me again if there's something in function_traits that needs fixing.