[WIP] glibc: Use /lib/ld-linux-armhf.so.3 for ARM's -mfloat-abi=hard ABI.

[Roland McGrath]

> It does for me (well, non-_[_A-Z] names; things such as _LP64 are also in 
> the reserved namespace).  There's 
> <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=545> for a limited number of 
> cases where such macros are defined from specs (that check textually for 
> the -ansi option, instead of for flag_iso as set inside cc1), but the bulk 
> of cases of that were fixed long ago.

What I was using in my earlier experiments was "Ubuntu 4.4.3-4ubuntu5.1" on
x86_64-linux-gnu native.  But I happen to have handy a GCC trunk from last
week sometime built for --target=arm-linux-gnueabi:

	$ ./xgcc -B./ -E -dM -std=c99 -x assembler-with-cpp /dev/null | grep '#define [^_]'
	#define unix 1
	#define linux 1