updated for version 7.4.511
Problem:    Generating proto for if_ruby.c uses type not defined elsewhere.
Solution:   Do not generate a prototype for
	    rb_gc_writebarrier_unprotect_promoted()
Added tag v7-4-511 for changeset 7623d953d3bc
updated for version 7.4.512
Problem:    Cannot generate prototypes for Win32 files and VMS.
Solution:   Add typedefs and #ifdef
Added tag v7-4-512 for changeset 9f9058aeba0d