fix: shellcheck for configure

configure

@@ -19,9 +19,9 @@ read_arg() {
     # $3 = arg parameter
     local rematch='^[^=]*=(.*)$'
     if [[ $2 =~ $rematch ]]; then
-        read "$1" <<< "${BASH_REMATCH[1]}"
+        read -r "$1" <<< "${BASH_REMATCH[1]}"
     else
-        read "$1" <<< "$3"
+        read -r "$1" <<< "$3"
         # There is no way to shift our callers args, so
         # return 1 to indicate they should do it instead.
         return 1
@@ -65,6 +65,7 @@ int main() {
 }
 EOF
 
+# shellcheck disable=SC2086
 ${CC} $CFLAGS $LDFLAGS conftest.c >/dev/null 2>&1
 ret=$?
 rm -f conftest.c a.out
@@ -85,7 +86,8 @@ EOF
 
 found=no
 for lib in "-lc" "-lfts"; do
-	${CC} $CFLAGS $LDFLAGS conftest.c -Wl,$lib >/dev/null 2>&1
+  # shellcheck disable=SC2086
+  ${CC} $CFLAGS $LDFLAGS conftest.c -Wl,$lib >/dev/null 2>&1
 	ret=$?
 	if test $ret -eq 0; then
 		FTS_LIBS="$lib"