libuv: bump to version 1.15.0

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libuv/libuv.hash

@@ -1,2 +1,2 @@
 # Locally calculated
-sha256 82fbbb0eaab4adcf8ed513d3b777c8e02ed2e77aae265baf6bd2d68cb84bc9e3  libuv-v1.14.1.tar.gz
+sha256  17afc94ec307be28fe8d4316679171219770df4f993905a79643c7583e106489  libuv-v1.15.0.tar.gz

package/libuv/libuv.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBUV_VERSION = v1.14.1
+LIBUV_VERSION = v1.15.0
 LIBUV_SITE = $(call github,libuv,libuv,$(LIBUV_VERSION))
 LIBUV_DEPENDENCIES = host-pkgconf
 LIBUV_INSTALL_STAGING = YES