(TARGET_SWITCHES): Add hard-quad-float, soft-quad-float.
(TARGET_DEFAULT): Use parentheses.
({ADDTF3,SUBTF3,MULTF3,DIVTF3,SQRTTF2,FLOATSITF2,FIX_TRUNCTFSI2,
EXTENDSFTF2,TRUNCTFSF2,EXTENDDFTF2,TRUNCTFDF2,EQTF2,NETF2,GTTF2,
GETF2,LTTF2,LETF2}_LIBCALL): New macros.

From-SVN: r6751