CONFIGURE: Avoid executing the (empty) output in the `dwp` check

ShellCheck SC2092 warning.

diff --git a/configure b/configure
index dfc6148..36ccab1 100755 (executable)
--- a/configure
+++ b/configure
@@ -2614,7 +2614,7 @@ if test "$_debug_build" != no; then
        #       isn't implemented, and there's no fix in sight. So we force
        #       DWARF version 4 and hope that works for, well... "most targets".
 
-       if command -v $_dwp >/dev/null 2>&1 && cc_check_no_clean $debug_mode -gsplit-dwarf -gdwarf-4 && `$_dwp -e $TMPO -o /dev/null >/dev/null 2>&1`; then
+       if command -v $_dwp >/dev/null 2>&1 && cc_check_no_clean $debug_mode -gsplit-dwarf -gdwarf-4 && $_dwp -e $TMPO -o /dev/null >/dev/null 2>&1; then
                append_var CXXFLAGS "-gsplit-dwarf -gdwarf-4"
                add_line_to_config_mk "SPLIT_DWARF = 1"
                echo_n -- " + split DWARF"