Few typo

Fix few typo and change défault optimisation lvl for O3 for gcc.

configure.in

@@ -962,10 +962,6 @@ fi
 # Debug
 #
 case $enable_debug in
-	"no")
-		# default value
-		CPPFLAGS="$CPPFLAGS"
-		;;
 	"yes")
 		if test $ac_cv_prog_cc_g = yes; then
 		    CPPFLAGS="$CPPFLAGS -g -DDEBUG"
@@ -978,12 +974,15 @@ case $enable_debug in
 	"gdb")
 		if test $ac_cv_prog_cc_g = yes; then
 		    CPPFLAGS="$CPPFLAGS -ggdb -DDEBUG"
-		    LDFLAGS="$LDFLAGS -g"
+		    LDFLAGS="$LDFLAGS -ggdb"
 		else
 		    echo "error: --enable-debug flag=$enable_debug entered but the compiler does not support -g"
 		    exit 1
                 fi
 		;;
+	*) # default value
+		CPPFLAGS="$CPPFLAGS"
+		;;
 esac
 
 #
@@ -1261,8 +1260,8 @@ else
 	AC_MSG_RESULT([no])
 fi
 
-CFLAGS="$OPT_LTO $CFLAGS" 
 CFLAGS_AR="$OPT_LTO_AR $CFLAGS"
+CFLAGS="$OPT_LTO $CFLAGS" 
 AC_SUBST([CFLAGS_AR])
 
 AC_MSG_NOTICE([Configure finish])