Bug#915334: icon FTBFS with glibc 2.28

[Adrian Bunk <bunk@debian.org>]

Source: icon
Version: 9.4.3-6
Severity: serious
Tags: ftbfs

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/icon.html

...
gcc -Wall -g -O2 -fno-strict-aliasing -fno-strict-overflow -fPIC -c fpoll.c
fpoll.c: In function 'fpoll':
fpoll.c:66:9: error: 'FILE' {aka 'struct _IO_FILE'} has no member named '__bufp'
    if (f->__bufp < f->__get_limit)
         ^~
fpoll.c:66:21: error: 'FILE' {aka 'struct _IO_FILE'} has no member named '__get_limit'
    if (f->__bufp < f->__get_limit)
                     ^~
make[4]: *** [Makefile:15: fpoll.o] Error 1