initial buildroot for linux 5.15

package/libgit2/Config.in

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+config BR2_PACKAGE_LIBGIT2
+	bool "libgit2"
+	depends on !BR2_STATIC_LIBS # libhttpparser
+	select BR2_PACKAGE_LIBHTTPPARSER
+	select BR2_PACKAGE_ZLIB
+	help
+	  libgit2 is a portable, pure C implementation of the Git core
+	  methods provided as a linkable library with a solid API,
+	  allowing to build Git functionality into your application.
+
+	  https://github.com/libgit2/libgit2
+
+comment "libgit2 needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS

package/libgit2/libgit2.hash

@@ -0,0 +1,3 @@
+# Locally calculated
+sha256  192eeff84596ff09efb6b01835a066f2df7cd7985e0991c79595688e6b36444e  libgit2-1.3.0.tar.gz
+sha256  8b7e4f54f8bf210c8fe010a49571a1ee57463ef020cc43f051d4d3fbb74942af  COPYING

package/libgit2/libgit2.mk

@@ -0,0 +1,48 @@
+################################################################################
+#
+# libgit2
+#
+################################################################################
+
+LIBGIT2_VERSION = 1.3.0
+LIBGIT2_SITE = $(call github,libgit2,libgit2,v$(LIBGIT2_VERSION))
+LIBGIT2_LICENSE = GPL-2.0 with linking exception, MIT (sha1), wildmatch license (wildmatch)
+LIBGIT2_LICENSE_FILES = COPYING
+LIBGIT2_CPE_ID_VENDOR = libgit2_project
+LIBGIT2_INSTALL_STAGING = YES
+
+LIBGIT2_CONF_OPTS = \
+	-DUSE_GSSAPI=OFF \
+	-DBUILD_CLAR=OFF \
+	-DUSE_ICONV=ON \
+	-DREGEX_BACKEND=regcomp \
+	-DUSE_HTTP_PARSER=system \
+	-DUSE_NTLMCLIENT=OFF \
+	-DTHREADSAFE=$(if $(BR2_TOOLCHAIN_HAS_THREADS),ON,OFF)
+
+LIBGIT2_DEPENDENCIES = zlib libhttpparser
+
+# If libiconv is available (for !locale toolchains), then we can use
+# it for iconv support. Note that USE_ICONV=ON is still correct even
+# without libiconv because (1) most toolchain have iconv support
+# without libiconv and (2) even if USE_ICONV=ON but iconv support is
+# not available, libgit2 simply avoids using iconv.
+ifeq ($(BR2_PACKAGE_LIBICONV),y)
+LIBGIT2_DEPENDENCIES += libiconv
+endif
+
+ifeq ($(BR2_PACKAGE_LIBSSH2),y)
+LIBGIT2_DEPENDENCIES += libssh2
+LIBGIT2_CONF_OPTS += -DUSE_SSH=ON
+else
+LIBGIT2_CONF_OPTS += -DUSE_SSH=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENSSL),y)
+LIBGIT2_DEPENDENCIES += openssl
+LIBGIT2_CONF_OPTS += -DUSE_HTTPS=OpenSSL
+else
+LIBGIT2_CONF_OPTS += -DUSE_HTTPS=OFF
+endif
+
+$(eval $(cmake-package))