Small fix in build-info script for better platform compatibility.

etc/utils/build_info.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 if [ -n "$1" ]; then CC="$1"; elif [ -z "$CC" ]; then CC="cc"; fi
 
-echo "Built    : `date -u +"%Y-%m-%d %H:%M:%S"`"
+echo "Built    : `date -u +'%Y-%m-%d %H:%M:%S'`"
 echo "Platform : `uname -s -r -v -m`"
 echo "Target   : `$CC -dumpmachine`"
-echo "Compiler : `$CC -v 2>&1 | grep -iE '\b(gcc|clang)\s+version\b' | head -n 1`"
+echo "Compiler : `$CC -v 2>&1 | grep -i '\(gcc\|clang\)[[:space:]]\{1,\}version' | head -n 1`"