[committed] Fix some MIPS entries in libgcc/config.host

[Richard Sandiford]

libgcc wasn't building the soft-float routines for mips-sde-elf,
because the config.host stanza removed t-mips from tmake_file.

Tested on mips-sde-elf and applied.   I should have noticed
this when the patches were posted for review, sorry.

Richard


libgcc/
        * config.host (mips*-sde-elf*, mipsisa64sr71k-*-elf*): Add to
        tmake_file rather replacing it.

Index: libgcc/config.host
===================================================================
--- libgcc/config.host  2011-12-14 22:34:31.000000000 +0000
+++ libgcc/config.host  2011-12-14 22:34:45.000000000 +0000
@@ -751,7 +751,7 @@ mips*-*-linux*)                             # Linux MIPS, 
either
 mips*-*-openbsd*)
        ;;
 mips*-sde-elf*)
-       tmake_file="mips/t-crtstuff mips/t-mips16"
+       tmake_file="$tmake_file mips/t-crtstuff mips/t-mips16"
        case "${with_newlib}" in
          yes)
            # newlib / libgloss.
@@ -771,7 +771,7 @@ mipsisa64r2-*-elf* | mipsisa64r2el-*-elf
        extra_parts="$extra_parts crti.o crtn.o"
        ;;
 mipsisa64sr71k-*-elf*)
-       tmake_file="mips/t-elf mips/t-crtstuff t-fdpbit"
+       tmake_file="$tmake_file mips/t-elf mips/t-crtstuff t-fdpbit"
        extra_parts="$extra_parts crti.o crtn.o"
         ;;
 mipsisa64sb1-*-elf* | mipsisa64sb1el-*-elf*)