[openwrt/openwrt] uboot-zynq: Fix build with libressl 2.7.2

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch master:
https://git.lede-project.org/5ca159ab3b36c97197bff6a50f65e1666a8f78ec

commit 5ca159ab3b36c97197bff6a50f65e1666a8f78ec
Author: Hauke Mehrtens <hauke at hauke-m.de>
AuthorDate: Sun Apr 29 00:39:38 2018 +0200

    uboot-zynq: Fix build with libressl 2.7.2
    
    When libressl was linked the libpthread was missing, add it in addition.
    
    Fixes: 2c192b69163f ("tools/libressl: update to version 2.7.2")
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 .../uboot-zynq/patches/210-link-libcrypto-static.patch     | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/package/boot/uboot-zynq/patches/210-link-libcrypto-static.patch b/package/boot/uboot-zynq/patches/210-link-libcrypto-static.patch
new file mode 100644
index 0000000..a260e84
--- /dev/null
+++ b/package/boot/uboot-zynq/patches/210-link-libcrypto-static.patch
@@ -0,0 +1,14 @@
+OpenWrt links the libressl statically against mkimage, make sure all the 
+needed dependencies are added too.
+
+--- a/tools/Makefile
++++ b/tools/Makefile
+@@ -128,7 +128,7 @@ endif
+ # MXSImage needs LibSSL
+ ifneq ($(CONFIG_MX23)$(CONFIG_MX28)$(CONFIG_FIT_SIGNATURE),)
+ HOSTLOADLIBES_mkimage += \
+-	$(shell pkg-config --libs libssl libcrypto 2> /dev/null || echo "-lssl -lcrypto")
++	$(shell pkg-config --libs --static libssl libcrypto 2> /dev/null || echo "-lssl -lpthread -lcrypto")
+ 
+ # OS X deprecate openssl in favour of CommonCrypto, supress deprecation
+ # warnings on those systems