[Ada] Add check for sys/capability.h

[Eric Botcazou]

In preparation for an upcoming improvement.

Tested on x86_64-suse-linux, applied on the mainline.


2017-05-22  Eric Botcazou  <ebotca...@adacore.com>

libada/
        * configure.ac: Add check for sys/capability.h header.
        (have_capability): New substitution.
        * configure: Regenerate.
        * Makefile.in (GNATLIBCFLAGS_FOR_C): Add @have_capability@.

-- 
Eric Botcazou
Index: Makefile.in
===================================================================
--- Makefile.in	(revision 248140)
+++ Makefile.in	(working copy)
@@ -61,7 +61,7 @@ PICFLAG = @PICFLAG@
 GNATLIBFLAGS= -W -Wall -gnatpg -nostdinc
 GNATLIBCFLAGS= -g -O2
 GNATLIBCFLAGS_FOR_C = -W -Wall $(GNATLIBCFLAGS) $(CFLAGS_FOR_TARGET) \
-	-fexceptions -DIN_RTS @have_getipinfo@
+	-fexceptions -DIN_RTS @have_getipinfo@ @have_capability@
 
 host_subdir = @host_subdir@
 GCC_DIR=$(MULTIBUILDTOP)../../$(host_subdir)/gcc
Index: configure.ac
===================================================================
--- configure.ac	(revision 248140)
+++ configure.ac	(working copy)
@@ -144,6 +144,10 @@ if test x$have_unwind_getipinfo = xyes;
 fi
 AC_SUBST(have_getipinfo)
 
+# Check for <sys/capability.h>
+AC_CHECK_HEADER([sys/capability.h], have_capability=-DHAVE_CAPABILITY, have_capability=)
+AC_SUBST(have_capability)
+
 # Determine what GCC version number to use in filesystem paths.
 GCC_BASE_VER