[RFC] Ignore source code comments in scripts/check-installed-headers.sh

[DJ Delorie]

Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> writes:
> With -fpreprocessed, we can still check for that:
>
> :: test.h
> ::::
> *** Obsolete types detected:
> ./test.h:#define ulong unsigned long
> ./test.h:ulong x;

I just tested this (gcc 4 and 7), and the #define didn't survive the
trip...

$ cat foo.c
#define ulong unsigned long

ulong x;  /* don't use ulong */

$ gcc -E -fpreprocessed foo.c
# 3 "foo.c"
ulong x;