libgit2: Enable pcre2 regexp backend

As a side effect it helps the builds where pcre is staged in native
sysroot and CMake system is confusing that and adds it to linker
cmdline, its evident with clang as cross compiler since it brings
libpcre-native into native sysroot

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Alistair Francis <alistair@alistair23.me>

meta-oe/recipes-support/libgit2/libgit2_1.0.0.bb

@@ -3,7 +3,7 @@ HOMEPAGE = "http://libgit2.github.com/"
 LICENSE = "GPL-2.0-with-GCC-exception & MIT"
 LIC_FILES_CHKSUM = "file://COPYING;md5=5b002a195fb7ea2d8d583f07eaff3a8e"
 
-DEPENDS = "curl openssl zlib libssh2 libgcrypt"
+DEPENDS = "curl openssl zlib libssh2 libgcrypt libpcre2"
 
 SRC_URI = "git://github.com/libgit2/libgit2.git;branch=maint/v1.0"
 SRCREV = "7d3c7057f0e774aecd6fc4ef8333e69e5c4873e0"
@@ -16,6 +16,7 @@ EXTRA_OECMAKE = "\
     -DBUILD_CLAR=OFF \
     -DCMAKE_BUILD_TYPE=RelWithDebInfo \
     -DLIB_INSTALL_DIR=${libdir} \
+    -DREGEX_BACKEND='pcre2' \
 "
 
 BBCLASSEXTEND = "native"