configure.ac: fix FxT case

configure.ac

@@ -765,7 +765,7 @@ fi
 
 
 # shall we use FxT to generate trace of the execution ?
-AC_MSG_CHECKING(whether fxt traces should be generated)
+AC_MSG_CHECKING(whether FxT traces should be generated)
 AC_ARG_WITH(fxt, [AS_HELP_STRING([--with-fxt[=<dir>]], [generate fxt traces])],
 	[
 		if test x$withval != xno; then