Install rcs2log within Emacs packages for Android

* doc/emacs/android.texi (Android Environment): Mention the
`rcs2log' program name variable.  Also refine the wording of the
paragraph describing bundled programs a bit.

* doc/lispref/processes.texi (Subprocess Creation): Mention
`rcs2log' and `rcs2log-program-name'.  Correct typos and
spelling mistakes within the variable index.

* etc/NEWS: Amend the announcement of *-program-name to also
cite rcs2log.

* java/Makefile.in (install_temp): Copy rcs2log to
lib/*/librcs2log.so after minor revisions to change the
interpreter name.

* lisp/vc/vc-rcs.el (vc-rcs-rcs2log-program): Ground the program
name upon `rcs2log-program-name'.

* src/callproc.c (syms_of_callproc) <Vrcs2log_program_name>: New
defvar.  Define to `librcs2log.so' under Android, `rcs2log'
elsewhere.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/callproc.c b/src/callproc.c
index dc37dfdc01f..082c65c4f14 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -2216,6 +2216,17 @@ the system.  */);
   Vebrowse_program_name = build_pure_c_string ("libebrowse.so");
 #endif
 
+  DEFVAR_LISP ("rcs2log-program-name", Vrcs2log_program_name,
+    doc: /* Name of the `rcs2log' program distributed with Emacs.
+Use this instead of calling `rcs2log' directly, as `rcs2log'
+may have been renamed to comply with executable naming restrictions on
+the system.  */);
+#if !defined HAVE_ANDROID || defined ANDROID_STUBIFY
+  Vrcs2log_program_name = build_pure_c_string ("rcs2log");
+#else /* HAVE_ANDROID && !ANDROID_STUBIFY */
+  Vrcs2log_program_name = build_pure_c_string ("librcs2log.so");
+#endif /* !HAVE_ANDROID || ANDROID_STUBIFY */
+
   defsubr (&Scall_process);
   defsubr (&Sgetenv_internal);
   defsubr (&Scall_process_region);