Whoops; correct two trivial mistakes in autoconf

configure.ac

@@ -279,7 +279,7 @@ if test "x$target_darwin" = "xno" && test "x$target_win32" = "xno"; then
     AC_FLDIGI_PKG_CHECK([x], [x11], [no], [yes])
 fi
 
-### jsoncpp
+### jpeg
 if test "x$ac_cv_want_fldigi" = "xyes"; then
     AC_FLDIGI_JPEG
 fi

m4/jsoncpp.m4

@@ -1,5 +1,5 @@
 AC_DEFUN([AC_FLDIGI_JSONCPP], [
-    AC_LANG_PUSH(C++)
+    AC_LANG_PUSH([C++])
     LIBS="$LIBS -ljsoncpp"
     AC_MSG_CHECKING([for libjsoncpp])
     AC_LINK_IFELSE(