libssh: bump to 0.7.6 CVE-2018-10933 fix

Bump from 0.7.5 to 0.7.6.  Upstream changelog:

Fixed CVE-2018-10933
Added support for OpenSSL 1.1
Added SHA256 support for ssh_get_publickey_hash()
Fixed config parsing
Fixed random memory corruption when importing pubkeys

Backported upstream patches since 0.7.6 to fix interactive
authentication issues amongst other things:

9d5cf209 libcrypto: Fix memory leak in evp_final()
10397321 gssapi: Set correct state after sending GSSAPI_RESPONSE (select mechanism OID)
7ad80ba1 server: Fix compile error
acb0e4f4 examples: Explicitly track auth state in samplesshd-kbdint
3fe7510b messages: Check that the requested service is 'ssh-connection'
734e3ce6 server: Set correct state after sending INFO_REQUEST (Kbd Interactive)
e4c6d591 packet: Add missing break in ssh_packet_incoming_filter()
f81ca616 misc: Add strndup implementation if not provides by the OS

Refresh patches.
Remove local backport for OpenSSL 1.1 support as is now in release
Remove PKG_INSTALL & CMAKE vars that are defaulted anyway
Add PKG_CPE_ID:=cpe:/a:libssh:libssh for CVE tracking
Remove BROKEN tag as is no longer broken

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

libs/libssh/Makefile

@@ -11,17 +11,18 @@ PKG_LICENSE:=LGPL-2.1+ BSD-2-Clause
 PKG_MAINTAINER:=Mislav Novakovic <mislav.novakovic@sartura.hr>
 
 PKG_NAME:=libssh
-PKG_VERSION:=0.7.5
-PKG_RELEASE:=2
+PKG_VERSION:=0.7.6
+PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
-PKG_SOURCE_URL:=https://red.libssh.org/attachments/download/218/
-PKG_HASH:=54e86dd5dc20e5367e58f3caab337ce37675f863f80df85b6b1614966a337095
+PKG_SOURCE_URL:=https://www.libssh.org/files/0.7/
+PKG_HASH:=1d607d3859274f755942324afb0f887ee22edd157f9596a2e69e3a28ec6d1092
+
+PKG_CPE_ID:=cpe:/a:libssh:libssh
 
 CMAKE_INSTALL:=1
 
 PKG_BUILD_PARALLEL:=1
-PKG_INSTALL:=1
 PKG_USE_MIPS16:=0
 
 include $(INCLUDE_DIR)/package.mk
@@ -32,7 +33,7 @@ define Package/libssh
   CATEGORY:=Libraries
   URL:=$(PKG_SOURCE_URL)
   TITLE:=SSH library
-  DEPENDS:=+libpthread +librt +zlib +libopenssl @BROKEN
+  DEPENDS:=+libpthread +librt +zlib +libopenssl
 endef
 
 define Package/libssh/description
@@ -41,8 +42,6 @@ define Package/libssh/description
 endef
 
 CMAKE_OPTIONS = \
-	-DCMAKE_INSTALL_PREFIX:PATH=/usr \
-	-DCMAKE_BUILD_TYPE:STRING=Release \
 	-DHAVE_STRTOULL=1 \
 	-DHAVE_GETADDRINFO=1 \
 	-DHAVE_TERMIOS_H=1 \