libcurl: security bump version to 7.50.1

Contains fixes for CVE-2016-5419..5421:
https://curl.haxx.se/docs/vuln-7.50.0.html

[Peter: extend commit message with CVE info]
Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libcurl/libcurl.hash

@@ -1,2 +1,2 @@
 # Locally calculated after checking pgp signature
-sha256 608dfe2db77f48db792c387e7791aca55a25f0b42385707ad927164199ecfa9a  curl-7.50.0.tar.bz2
+sha256 3c12c5f54ccaa1d40abc65d672107dcc75d3e1fcb38c267484334280096e5156  curl-7.50.1.tar.bz2

package/libcurl/libcurl.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBCURL_VERSION = 7.50.0
+LIBCURL_VERSION = 7.50.1
 LIBCURL_SOURCE = curl-$(LIBCURL_VERSION).tar.bz2
 LIBCURL_SITE = http://curl.haxx.se/download
 LIBCURL_DEPENDENCIES = host-pkgconf \