Exclude some include files from include-fixed directory

[th-otto]

Fix some include files to prevent them from ending up in the include-fixed directory when compiling gcc.

There are still some files ending up there:

• bits/string2.h, due to the definition of strncpy (gcc wants it to be defined just as __builtin_strncpy)
• math.h, due to the definition of exception for c++, although it is protected and uses the same mechanism as seen in recent glibc header
• sys/syslog.h, due to the definition of __BSD_VA_LIST

The output from the fixincludes run is:
Fixing directory /usr/m68k-atari-mint/sys-root/usr/include into /home/sebilla/mintstd/mint7-build/gcc/include-fixed
Applying glibc_c99_inline_3 to bits/string2.h
Applying glibc_strncpy to bits/string2.h
Fixed: bits/string2.h
Applying machine_ansi_h_va_list to sys/syslog.h
Fixed: sys/syslog.h
Applying glibc_stdint to stdint.h
Applying sysv68_string to string.h
Applying sun_malloc to malloc.h
Applying math_exception to math.h
Fixed: math.h
Cleaning up unneeded directories:
fixincludes is done

The patterns that are searched for are defined in ../gcc-src/fixincludes/inclhack.def