[PATCH 4/8] libbacktrace: use grep -F instead of fgrep

[Xi Ruoyao <xry111@xry111.site>]

fgrep has been deprecated in favor of grep -F for a long time, and the
next grep release (3.8 or 4.0) will print a warning of fgrep is used.
Stop using fgrep so we won't see the warning.

libbacktrace/ChangeLog:

	* configure.ac: Use grep -F instead of fgrep.
	* configure: Regenerate.
---
 libbacktrace/configure    | 2 +-
 libbacktrace/configure.ac | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libbacktrace/configure b/libbacktrace/configure
index 17f470a4bec..45173b08fb6 100755
--- a/libbacktrace/configure
+++ b/libbacktrace/configure
@@ -13831,7 +13831,7 @@ else
   libbacktrace_cv_objcopy_debuglink=no
 elif ! test -n "${OBJCOPY}"; then
   libbacktrace_cv_objcopy_debuglink=no
-elif ${OBJCOPY} --help | fgrep add-gnu-debuglink >/dev/null 2>&1; then
+elif ${OBJCOPY} --help | grep -F add-gnu-debuglink >/dev/null 2>&1;
then
   libbacktrace_cv_objcopy_debuglink=yes
 else
   libbacktrace_cv_objcopy_debuglink=no
diff --git a/libbacktrace/configure.ac b/libbacktrace/configure.ac
index 597c9705db8..bcce4f31b85 100644
--- a/libbacktrace/configure.ac
+++ b/libbacktrace/configure.ac
@@ -500,7 +500,7 @@ AC_CACHE_CHECK([whether objcopy supports debuglink],
   libbacktrace_cv_objcopy_debuglink=no
 elif ! test -n "${OBJCOPY}"; then
   libbacktrace_cv_objcopy_debuglink=no
-elif ${OBJCOPY} --help | fgrep add-gnu-debuglink >/dev/null 2>&1; then
+elif ${OBJCOPY} --help | grep -F add-gnu-debuglink >/dev/null 2>&1;
then
   libbacktrace_cv_objcopy_debuglink=yes
 else
   libbacktrace_cv_objcopy_debuglink=no
-- 
2.36.1