libgit2: bump version to 0.27.1

Fixes a security vulnerability similar to git's CVE-2018-11235

This release changes some configuration options, so tweak them
accordingly.

Signed-off-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libgit2/libgit2.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256	6a62393e0ceb37d02fe0d5707713f504e7acac9006ef33da1e88960bd78b6eac  libgit2-v0.26.0.tar.gz
+sha256	837b11927bc5f64e7f9ab0376f57cfe3ca5aa52ffd2007ac41184b21124fb086  libgit2-v0.27.1.tar.gz
 sha256	d9a8038088df84fde493fa33a0f1e537252eeb9642122aa4b862690197152813  COPYING

package/libgit2/libgit2.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBGIT2_VERSION = v0.26.0
+LIBGIT2_VERSION = v0.27.1
 LIBGIT2_SITE = $(call github,libgit2,libgit2,$(LIBGIT2_VERSION))
 LIBGIT2_LICENSE = GPL-2.0 with linking exception
 LIBGIT2_LICENSE_FILES = COPYING
@@ -36,9 +36,9 @@ endif
 
 ifeq ($(BR2_PACKAGE_OPENSSL),y)
 LIBGIT2_DEPENDENCIES += openssl
-LIBGIT2_CONF_OPTS += -DUSE_OPENSSL=ON
+LIBGIT2_CONF_OPTS += -DUSE_HTTPS=OpenSSL
 else
-LIBGIT2_CONF_OPTS += -DUSE_OPENSSL=OFF
+LIBGIT2_CONF_OPTS += -DUSE_HTTPS=OFF
 endif
 
 ifeq ($(BR2_PACKAGE_LIBCURL),y)