explicitly state what is not API

git-svn-id: https://svn.r-project.org/R/trunk@86459 00db46b3-68df-0310-9c12-caf00c1e9a41

src/include/R_ext/Altrep.h

@@ -17,6 +17,10 @@
  *  https://www.R-project.org/Licenses/
  */
 
+/* 
+   Not part of the API, subject to change at any time.
+*/
+
 #ifndef R_EXT_ALTREP_H_
 #define R_EXT_ALTREP_H_
 

src/include/R_ext/MathThreads.h

@@ -24,6 +24,8 @@
 /*
   Experimental: included by src/library/stats/src/distance.c
 
+  Not part of the API.
+
   Note that only uses R_num_math_threads: it is not clear
   R_num_math_threads should be exposed at all.
 

src/include/R_ext/Parse.h

@@ -20,6 +20,7 @@
 /* NOTE:
    This file exports a part of the current internal parse interface.
    It is subject to change at any minor (x.y.0) version of R.
+   So not API.
  */
 
 #ifndef R_EXT_PARSE_H_

src/include/R_ext/Rallocators.h

@@ -23,6 +23,8 @@
  *
  *  Definition of the R_allocator_t structure for custom allocators
  *  to be used with allocVector3()
+ *
+ * Not API
  */
 
 #ifndef R_EXT_RALLOCATORS_H_

src/include/R_ext/stats_package.h

@@ -21,6 +21,8 @@
  *  https://www.R-project.org/Licenses/
  */
 
+/* Not part of the API */
+
 #ifndef R_STATS_PACKAGE_H
 #define R_STATS_PACKAGE_H
 #include <Rconfig.h>

src/include/R_ext/stats_stubs.h

@@ -21,6 +21,8 @@
  *  https://www.R-project.org/Licenses/
  */
 
+/* Not part of the API */
+
 #include <Rconfig.h>
 #include <Rinternals.h>
 #include <R_ext/Rdynload.h>