patch 7.4.2111

Problem:    Defaults are very conservative.
Solution:   Move settings from vimrc_example.vim to defaults.vim.  Load
            defaults.vim if no .vimrc was found.

src/feature.h

@@ -905,6 +905,11 @@
 /* #define USR_VIMRC_FILE2	"~/bar/.vimrc" */
 /* #define USR_VIMRC_FILE3	"$VIM/.vimrc" */
 
+/*
+ * VIM_DEFAULTS_FILE	Name of the defaults.vim script file
+ */
+/* #define VIM_DEFAULTS_FILE	"$VIMRUNTIME/defaults.vim" */
+
 /*
  * EVIM_FILE		Name of the evim.vim script file
  */