configure: Include #define name in check_define compiler error

Include the name of the #define being tested for in the compiler
error produced when a check_define test is run and fails. This
appears only in the config.log, but it does make it a little easier
to debug problems by inspecting config.log.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>

configure

@@ -249,7 +249,7 @@ source_path=`cd "$source_path"; pwd`
 check_define() {
 cat > $TMPC <<EOF
 #if !defined($1)
-#error Not defined
+#error $1 not defined
 #endif
 int main(void) { return 0; }
 EOF