haproxy: Update HAProxy to v2.0.14

- Update haproxy download URL and hash
- Add new patches (see https://www.haproxy.org/bugs/bugs-2.0.14.html)
- This fixes CVE-2020-11100 (http://git.haproxy.org/?p=haproxy-2.0.git;a=commit;h=b9cac598021e2b0d4ae2cfecf9825a3469328093)

Signed-off-by: Christian Lachner <gladiac@gmail.com>

net/haproxy/patches/000-OPENWRT-add-uclibc-support.patch

@@ -1,18 +0,0 @@
---- a/Makefile
-+++ b/Makefile
-@@ -334,6 +334,15 @@ ifeq ($(TARGET),linux-glibc)
-     USE_ACCEPT4 USE_LINUX_SPLICE USE_PRCTL USE_THREAD_DUMP USE_GETADDRINFO)
- endif
- 
-+# For linux >= 2.6.28 and uclibc
-+ifeq ($(TARGET),linux-uclibc)
-+  set_target_defaults = $(call default_opts, \
-+    USE_POLL USE_TPROXY USE_DL USE_RT USE_NETFILTER                           \
-+    USE_CPU_AFFINITY USE_THREAD USE_EPOLL USE_FUTEX USE_LINUX_TPROXY          \
-+    USE_ACCEPT4 USE_LINUX_SPLICE USE_PRCTL USE_THREAD_DUMP USE_NS USE_TFO     \
-+    USE_GETADDRINFO)
-+endif
-+
- # Solaris 8 and above
- ifeq ($(TARGET),solaris)
-   # We also enable getaddrinfo() which works since solaris 8.