libtool.m4: Change libtool to handle sysroots by default

Rather than using no sysroot by default, always query gcc to obtain the sysroot.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Upstream-Status: Inappropriate [Upstream are unlikely to accept this change of default]

---
 m4/libtool.m4 | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: libtool-2.5.0/m4/libtool.m4
===================================================================
--- libtool-2.5.0.orig/m4/libtool.m4
+++ libtool-2.5.0/m4/libtool.m4
@@ -1253,18 +1253,18 @@ dnl lt_sysroot will always be passed unq
 dnl in case the user passed a directory name.
 lt_sysroot=
 case $with_sysroot in #(
- yes)
+ no)
    if test yes = "$GCC"; then
      # Trim trailing / since we'll always append absolute paths and we want
      # to avoid //, if only for less confusing output for the user.
      lt_sysroot=`$CC --print-sysroot 2>/dev/null | $SED 's:/\+$::'`
    fi
    ;; #(
+ yes|''|/)
+   ;; #(
  /*)
    lt_sysroot=`echo "$with_sysroot" | $SED -e "$sed_quote_subst"`
    ;; #(
- no|'')
-   ;; #(
  *)
    AC_MSG_RESULT([$with_sysroot])
    AC_MSG_ERROR([The sysroot must be an absolute path.])