[patch] purge obseleted configurations, top level

This purges some configurations from the top level which were recently
obseleted in gcc (and which I believe to be already obselete in gdb).
This is rather conservative, as I suspect that there are other
configurations in here which were obseleted earlier, but I didn't try to
catch them during this pass.  Tested on i686-pc-linux-gnu.

2002-05-27  Nathanael Nerode  <neroden@xxxxxxxxxxxx>
        * configure.in: Purge some obselete configurations.

*** configure.in.old    Mon May 27 01:18:07 2002
--- configure.in        Mon May 27 11:54:39 2002
***************
*** 734,742 ****
    thumb-*-pe)
      noconfigdirs="$noconfigdirs target-libgloss ${libgcj}"
      ;;
-   arm-*-riscix*)
-     noconfigdirs="$noconfigdirs ld target-libgloss ${libgcj}"
-     ;;
    c4x-*-*)
      noconfigdirs="$noconfigdirs ${libstdcxx_version} target-librx 
target-libgloss ${libgcj}"
      ;;
--- 734,739 ----
***************
*** 938,946 ****
    rs6000-*-*)
      noconfigdirs="$noconfigdirs gprof ${libgcj}"
      ;;
-   m68k-apollo-*)
-     noconfigdirs="$noconfigdirs ld binutils gprof target-libgloss ${libgcj}"
-     ;;
    mips*-*-irix5*)
      # The GNU linker does not support shared libraries.
      noconfigdirs="$noconfigdirs ld gprof target-libgloss ${libgcj}"
--- 935,940 ----
***************
*** 953,964 ****
      # <oldham@xxxxxxxxxxxxxxxx>
      noconfigdirs="$noconfigdirs gas gprof target-libgloss ${libgcj}"
      ;;
-   mips*-dec-bsd*)
-     noconfigdirs="$noconfigdirs gprof target-libgloss ${libgcj}"
-     ;;
-   mips*-*-bsd*)
-     noconfigdirs="$noconfigdirs gprof target-libgloss ${libgcj}"
-     ;;
    mipstx39-*-*)
      noconfigdirs="$noconfigdirs gprof ${libgcj}"   # same as generic mips
      target_configdirs="${target_configdirs} target-bsp target-libstub 
target-cygmon"
--- 947,952 ----
***************
*** 970,975 ****
--- 958,964 ----
      noconfigdirs="$noconfigdirs gprof ${libgcj}"
      ;;
    romp-*-*)
+     # should be deleted after GCC 3.2 unless support is reenabled
      noconfigdirs="$noconfigdirs bfd binutils ld gas opcodes target-libgloss 
${libgcj}"
      ;;
    sh-*-*)