[commit] Always define the macros (when not defined)

[Andrew Cagney]

Hello,

This simplifies a little part of the gdbarch stuff, changing:

-#if GDB_MULTI_ARCH
-#if (GDB_MULTI_ARCH > GDB_MULTI_ARCH_PARTIAL) || !defined 
(TARGET_ARCHITECTURE)
  #define TARGET_ARCHITECTURE (gdbarch_bfd_arch_info (current_gdbarch))
  #endif
-#endif

to:

+#if !defined (TARGET_ARCHITECTURE)
  #define TARGET_ARCHITECTURE (gdbarch_bfd_arch_info (current_gdbarch))
  #endif

the old convoluted condition dates back to when many many things were 
still relying on #ifdef.

The simplification doesn't affect multi-arch targets.  It does affect 
the sparc-elf, which hasn't yet quite made it though - recent changes 
broke its build and this helps fix it (besides, I needed an excuse for 
simplifying gdbarch.sh a little :-).

committed,
Andrew
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