#677 auto-generated c files: function list drop down greyed out

[Jannick]

svn11386: Autogenerated .c-files (e.g. generated by flex and bison) are not parsed any more such that

• the function list drop down is greyed out when the auto-generated c file is activated.
• the names of functions defined in the auto-generated file are not available for auto-completion when any project file is activated.

This changed against the March 10, 2018, nightly.