[gcc r13-1800] libgo: use POSIX shell arithmetic expansion

[Ian Lance Taylor <ian@gcc.gnu.org>]

https://gcc.gnu.org/g:cf1725610526fe347d2530455b32affc033fd7fc

commit r13-1800-gcf1725610526fe347d2530455b32affc033fd7fc
Author: Ian Lance Taylor <iant@golang.org>
Date:   Fri Jul 22 11:38:20 2022 -0700

    libgo: use POSIX shell arithmetic expansion
    
    Avoid bash-specific ((expression)) syntax.  As the bash syntax
    converts a non-zero value to a zero status (and a zero value to a 1
    status), and POSIX arithmetic expansion does not, we have to negate
    the result.
    
    Based on patch by Sören Tempel.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/419154

Diff:
---
 gcc/go/gofrontend/MERGE | 2 +-
 libgo/match.sh          | 2 +-
 libgo/testsuite/gotest  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index 5ea0406cd8e..2f2fafde1f1 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-ff68b1a147eb60082fd60c198db0ef5477ade938
+a62f20ae78ddd41be682dde8cab075ca4f5dbb2a
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/libgo/match.sh b/libgo/match.sh
index 7ed587ff794..e5ed98de422 100755
--- a/libgo/match.sh
+++ b/libgo/match.sh
@@ -111,7 +111,7 @@ gobuild() {
     if test "$goarch" != "386"; then
 	line=$(echo "$line" | sed -e "s/\\(${wrap}\\)386\\(${wrap}\\)/\10\2/g")
     fi
-    (($line))
+    return $((!($line)))
 }
 
 matched=
diff --git a/libgo/testsuite/gotest b/libgo/testsuite/gotest
index 04e4267fbba..0a0a7e14d74 100755
--- a/libgo/testsuite/gotest
+++ b/libgo/testsuite/gotest
@@ -302,7 +302,7 @@ gobuild() {
     if test "$goarch" != "386"; then
 	line=$(echo "$line" | sed -e "s/\\(${wrap}\\)386\\(${wrap}\\)/\10\2/g")
     fi
-    (($line))
+    return $((!($line)))
 }
 
 case "x$gofiles" in