package/libcurl: security bump to version 7.66.0

Fixes the following security vulnerabilities:

CVE-2019-5481: FTP-KRB double-free
https://curl.haxx.se/docs/CVE-2019-5481.html

CVE-2019-5482: TFTP small blocksize heap buffer overflow
https://curl.haxx.se/docs/CVE-2019-5482.html

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 26832000650b4f2e1c5126009abe18d52cb97766)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libcurl/libcurl.hash

@@ -1,5 +1,5 @@
 # Locally calculated after checking pgp signature
-# https://curl.haxx.se/download/curl-7.65.3.tar.xz.asc
+# https://curl.haxx.se/download/curl-7.66.0.tar.xz.asc
 # with key 27EDEAF22F3ABCEB50DB9A125CC908FDB71E12C2
-sha256 f2d98854813948d157f6a91236ae34ca4a1b4cb302617cebad263d79b0235fea  curl-7.65.3.tar.xz
+sha256 dbb48088193016d079b97c5c3efde8efa56ada2ebf336e8a97d04eb8e2ed98c1  curl-7.66.0.tar.xz
 sha256 8c8824f50e73a021f5dde1fccbf69685939247399a33a32abab1fa448c9ddabb  COPYING

package/libcurl/libcurl.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBCURL_VERSION = 7.65.3
+LIBCURL_VERSION = 7.66.0
 LIBCURL_SOURCE = curl-$(LIBCURL_VERSION).tar.xz
 LIBCURL_SITE = https://curl.haxx.se/download
 LIBCURL_DEPENDENCIES = host-pkgconf \