package/nginx: fix openssl support

Change to using pkg-config to find openssl and its dependencies.

This fixes:
 http://autobuild.buildroot.net/results/17db76c3a099e7592af343bbe119dfe717cd7999/

Signed-off-by: Martin Bark <martin@barkynet.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/nginx/0006-auto-lib-openssl-conf-use-pkg-config.patch

@@ -0,0 +1,31 @@
+From 756556d127da291cad8a2c007a89124a692aef7f Mon Sep 17 00:00:00 2001
+From: Martin Bark <martin@barkynet.com>
+Date: Fri, 6 May 2016 14:48:31 +0100
+Subject: [PATCH 6/8] auto/lib/openssl/conf: use pkg-config
+
+Change to using pkg-config to find the path to openssl and its
+dependencies.
+
+Signed-off-by: Martin Bark <martin@barkynet.com>
+---
+ auto/lib/openssl/conf | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/auto/lib/openssl/conf b/auto/lib/openssl/conf
+index 39d9602..995c6f3 100644
+--- a/auto/lib/openssl/conf
++++ b/auto/lib/openssl/conf
+@@ -50,8 +50,8 @@ else
+         ngx_feature_name="NGX_OPENSSL"
+         ngx_feature_run=no
+         ngx_feature_incs="#include <openssl/ssl.h>"
+-        ngx_feature_path=
+-        ngx_feature_libs="-lssl -lcrypto $NGX_LIBDL"
++        ngx_feature_path="$(${PKG_CONFIG:=pkg-config} --cflags-only-I openssl|sed 's/-I//g')"
++        ngx_feature_libs="$(${PKG_CONFIG:=pkg-config} --libs openssl)"
+         ngx_feature_test="SSL_CTX_set_options(NULL, 0)"
+         . auto/feature
+ 
+-- 
+2.8.2
+