add libgit2 component

component/libgit2/buildout.cfg

+[buildout]
+extends =
+  ../cmake/buildout.cfg
+  ../openssl/buildout.cfg
+  ../pkgconfig/buildout.cfg
+  ../pcre/buildout.cfg
+  ../xz-utils/buildout.cfg
+  ../zlib/buildout.cfg
+
+parts = libgit2
+
+[libgit2]
+recipe  = slapos.recipe.cmmi
+url = https://github.com/libgit2/libgit2/archive/refs/tags/v${:version}.tar.gz
+md5sum = 9f4ca15249e703ab88cbc929187750cd
+version = 1.1.0
+shared = true
+configure-command =
+  cmake
+configure-options =
+  -Bbuild
+  -DCMAKE_BUILD_TYPE=Release
+  -DCMAKE_INSTALL_PREFIX=@@LOCATION@@
+  -DCMAKE_C_FLAGS="${:CMAKE_CFLAGS}"
+  -DCMAKE_INSTALL_RPATH=${:CMAKE_LIBRARY_PATH}
+  -G"Unix Makefiles"
+
+make-options = -C build
+environment =
+  PKG_CONFIG_PATH=${openssl-1.0:location}/lib/pkgconfig:${zlib:location}/lib/pkgconfig:${xz-utils:location}/lib/pkgconfig
+  PATH=${pkgconfig:location}/bin:${cmake:location}/bin:%(PATH)s
+  LDFLAGS=-L${openssl-1.0:location}/lib -Wl,-rpath=${openssl-1.0:location}/lib -L${pcre:location}/lib -Wl,-rpath=${pcre:location}/lib
+CMAKE_CFLAGS = -I${openssl-1.0:location}/include -I${zlib:location}/include -I${pcre:location}/include
+CMAKE_LIBRARY_PATH=${zlib:location}/lib:${openssl-1.0:location}/lib:${pcre:location}/lib