[PATCH] fix matching of vxworks7 in libgcc's configuration

[Olivier Hainque <hainque at adacore dot com>]

Part of the VxWorks 7 configuration specificities is triggered by this piece
in libgcc/config.host:

  # Common parts for widely ported systems.
  case ${host} in
  ...
  *-*-vxworks7)
    tmake_file=t-vxworks7
    ;;

For the powerpc family of targets, this should apply to SPE targets as well.

However, these are typically canonicalized as *-vxworks7spe and the case filter
above fails to match that.

This causes a build failure of libgcc when configured for e500v2-wrs-vxworks,
complaining that semLib.h could not be found while compiling vxlib-tls.c,
despite VSB_DIR being set and the sequence of -I that should allow finding it
in t-vxworks7.

Indeed, we mistakenly use t-vxworks instead of t-vxworks7, and the former
relies on a different environment variable to locate the header files (as
expected for versions of VxWorks prior to 7).

The attached patch fixes this by adding a wildcard after vxworks7 in the
case filter quoted above.

Committing to mainline, after checking that it has the intended effect and
lets the build proceed further.

Olivier

2018-09-01  Olivier Hainque  <hainque@adacore.com>

	libgcc/
	* config.host (*-*-vxworks7): Widen scope to vxworks7*.

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