3658. [port] linux: Address platform specific compilation issue

                        when libcap-devel is installed. [RT #34838]

CHANGES

+3658.	[port]		linux: Address platform specific compilation issue
+			when libcap-devel is installed. [RT #34838]
+
 3657.	[port]		Some readline clones don't accept NULL pointers when
 			calling add_history. [RT #34842]
 

bin/named/unix/os.c

@@ -117,12 +117,12 @@ static int dfd[2] = { -1, -1 };
 static isc_boolean_t non_root = ISC_FALSE;
 static isc_boolean_t non_root_caps = ISC_FALSE;
 
-#ifdef HAVE_LINUX_TYPES_H
-#include <linux/types.h>
-#endif
 #ifdef HAVE_SYS_CAPABILITY_H
 #include <sys/capability.h>
 #else
+#ifdef HAVE_LINUX_TYPES_H
+#include <linux/types.h>
+#endif
 /*%
  * We define _LINUX_FS_H to prevent it from being included.  We don't need
  * anything from it, and the files it includes cause warnings with 2.2

configure

@@ -18066,17 +18066,28 @@ fi
 done
-		for ac_header in linux/capability.h sys/capability.h
+		for ac_header in sys/capability.h
 do :
-  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
-ac_fn_c_check_header_compile "$LINENO" "$ac_header" "$as_ac_Header" "#ifdef HAVE_LINUX_TYPES_H
+  ac_fn_c_check_header_mongrel "$LINENO" "sys/capability.h" "ac_cv_header_sys_capability_h" "$ac_includes_default"
+if test "x$ac_cv_header_sys_capability_h" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_SYS_CAPABILITY_H 1
+_ACEOF
+
+fi
+
+done
+
+		for ac_header in linux/capability.h
+do :
+  ac_fn_c_check_header_compile "$LINENO" "linux/capability.h" "ac_cv_header_linux_capability_h" "#ifdef HAVE_LINUX_TYPES_H
 				  #include <linux/types.h>
 				  #endif
 "
-if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
+if test "x$ac_cv_header_linux_capability_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+#define HAVE_LINUX_CAPABILITY_H 1
 _ACEOF
 fi

configure.in

@@ -2637,7 +2637,8 @@ AC_ARG_ENABLE(linux-caps,
 case "$enable_linux_caps" in
 	yes|'')
 		AC_CHECK_HEADERS(linux/types.h)
-		AC_CHECK_HEADERS([linux/capability.h sys/capability.h], [], [],
+		AC_CHECK_HEADERS([sys/capability.h])
+		AC_CHECK_HEADERS([linux/capability.h], [], [],
 				 [#ifdef HAVE_LINUX_TYPES_H
 				  #include <linux/types.h>
 				  #endif