Fix compiler warnings with GCC 8.1.
GCC 8.1 added some new warnings, including warning about parentheses with no effect in variable declarations. GTK2 headers have a few of these, which produce a lot of warnings in projects using GTK2.
The warnings look like:
/usr/include/gtk-2.0/gtk/gtkfilechooserbutton.h:59:8: warning:
unnecessary parentheses in declaration of ‘__gtk_reserved1’ [-Wparentheses]
void (*__gtk_reserved1);
^
Removing the parentheses is harmless and fixes the warnings.
Edited by John Lindgren