c-ares: new package

Add c-ares library from bug #6482.
Most of the credit goes to Gennady Proskurin <gpq@mail.ru>

[Thomas: fix comment explaining why we need autoreconf.]

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/Config.in

@@ -630,6 +630,7 @@ source "package/mediastreamer/Config.in"
 endmenu
 
 menu "Networking"
+source "package/c-ares/Config.in"
 source "package/cppzmq/Config.in"
 source "package/czmq/Config.in"
 source "package/filemq/Config.in"

package/c-ares/Config.in

@@ -0,0 +1,6 @@
+config BR2_PACKAGE_C_ARES
+	bool "c-ares"
+	help
+	  C library for asynchronous DNS requests.
+
+	  http://c-ares.haxx.se/

package/c-ares/c-ares-01-use_check_build_instead_of_check_user.patch

@@ -0,0 +1,17 @@
+Use XC_CHECK_BUILD_FLAGS instead of XC_CHECK_USER_FLAGS.
+Otherwise it complains of CPPFLAGS in CFLAGS.
+
+Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
+
+diff -Nura c-ares-1.10.0.orig/m4/xc-cc-check.m4 c-ares-1.10.0/m4/xc-cc-check.m4
+--- c-ares-1.10.0.orig/m4/xc-cc-check.m4	2013-12-26 19:40:46.354195974 -0300
++++ c-ares-1.10.0/m4/xc-cc-check.m4	2013-12-26 19:41:01.850718535 -0300
+@@ -59,7 +59,7 @@
+ 
+ AC_DEFUN([_XC_PROG_CC], [
+   AC_REQUIRE([_XC_PROG_CC_PREAMBLE])dnl
+-  AC_REQUIRE([XC_CHECK_USER_FLAGS])dnl
++  AC_REQUIRE([XC_CHECK_BUILD_FLAGS])dnl
+   AC_REQUIRE([AC_PROG_INSTALL])dnl
+   AC_REQUIRE([AC_PROG_CC])dnl
+   AC_REQUIRE([AM_PROG_CC_C_O])dnl

package/c-ares/c-ares.mk

@@ -0,0 +1,16 @@
+################################################################################
+#
+# c-ares
+#
+################################################################################
+
+C_ARES_VERSION = 1.10.0
+C_ARES_SITE = http://c-ares.haxx.se/download
+C_ARES_INSTALL_STAGING = YES
+# Rebuild configure to avoid XC_CHECK_USER_CFLAGS
+C_ARES_AUTORECONF = YES
+C_ARES_LICENSE = MIT
+# No standalone, use some source file
+C_ARES_LICENSE_FILES = ares_mkquery.c
+
+$(eval $(autotools-package))