decouple internal.h headers

Saves comitters' daily life by avoid #include-ing everything from
internal.h to make each file do so instead.  This would significantly
speed up incremental builds.

We take the following inclusion order in this changeset:

1.  "ruby/config.h", where _GNU_SOURCE is defined (must be the very
    first thing among everything).
2.  RUBY_EXTCONF_H if any.
3.  Standard C headers, sorted alphabetically.
4.  Other system headers, maybe guarded by #ifdef
5.  Everything else, sorted alphabetically.

Exceptions are those win32-related headers, which tend not be self-
containing (headers have inclusion order dependencies).

1 files changed, 8 insertions, 0 deletions

diff --git a/internal/vm.h b/internal/vm.h
index e9d2d09c6c..1bd7a98f7a 100644
--- a/internal/vm.h
+++ b/internal/vm.h
@@ -15,6 +15,14 @@
 #include "ruby/ruby.h"              /* for ID */
 #include "ruby/st.h"                /* for st_table */
 
+#ifdef rb_funcallv
+# undef rb_funcallv
+#endif
+
+#ifdef rb_method_basic_definition_p
+# undef rb_method_basic_definition_p
+#endif
+
 /* I have several reasons to choose 64 here:
  *
  * - A cache line must be a power-of-two size.