[libsigc++2] Remove the (generated) sigc++/hide.h header.

[Murray Cumming <murrayc src gnome org>]

commit 63eb3c4b86af3887a1cee6cf2efeca60e00fa0b6
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Aug 12 10:45:56 2015 +0200

    Remove the (generated) sigc++/hide.h header.
    
    Because it now contains no API.
    See https://bugzilla.gnome.org/show_bug.cgi?id=752560#c6
    
    The generated sigc++/hide file did not include sigc++/adaptors/hide.h
    so it did not exist as a convenience.

 sigc++/filelist.am      |    3 +--
 sigc++/macros/hide.h.m4 |   23 -----------------------
 2 files changed, 1 insertions(+), 25 deletions(-)
---
diff --git a/sigc++/filelist.am b/sigc++/filelist.am
index 8486b8e..9e50e1f 100644
--- a/sigc++/filelist.am
+++ b/sigc++/filelist.am
@@ -17,11 +17,10 @@
 
 # Base (./)
 base_m4 = template.macros.m4 signal.h.m4 slot.h.m4 \
-         hide.h.m4 \
          limit_reference.h.m4
 base_built_cc =
 base_built_h = signal.h slot.h \
-              hide.h limit_reference.h
+              limit_reference.h
 
 # Functors (functors/)
 functors_m4 = functor_trait.h.m4 slot.h.m4 ptr_fun.h.m4 mem_fun.h.m4