initial buildroot for linux 5.15

package/libcgi/Config.in

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+config BR2_PACKAGE_LIBCGI
+	bool "libcgi"
+	help
+	  LibCGI is a library written from scratch to easily make
+	  CGI applications in C.
+
+	  There are a lot of functions like string manipulation,
+	  session and cookie support, GET and POST methods manipulation
+	  etc..., to help you to quickly write powerful CGI programs.
+
+	  https://github.com/rafaelsteil/libcgi/

package/libcgi/libcgi.hash

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+# From https://github.com/rafaelsteil/libcgi/releases/download/v1.3.0/libcgi-1.3.0.tar.gz.md5
+md5 6efdc968bdf986832b7e220d1b914e57  libcgi-1.3.0.tar.gz
+# From https://github.com/rafaelsteil/libcgi/releases/download/v1.3.0/libcgi-1.3.0.tar.gz.sha256
+sha256  d932f380b1a5dbfbddffaa76fac71bf505a9585d441c9ae86bfbf76033d9d8df  libcgi-1.3.0.tar.gz
+
+# Hash for license file:
+sha256  dc626520dcd53a22f727af3ee42c770e56c97a64fe3adb063799d8ab032fe551  LICENSES/LGPL-2.1.txt
+sha256  f32c31e26ec840753a8cd47cd2681e48be4cee853212d16a4b1d85ac4d677669  LICENSES/MIT.txt

package/libcgi/libcgi.mk

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+################################################################################
+#
+# libcgi
+#
+################################################################################
+
+LIBCGI_VERSION = 1.3.0
+LIBCGI_SITE = https://github.com/rafaelsteil/libcgi/releases/download/v$(LIBCGI_VERSION)
+
+LIBCGI_INSTALL_STAGING = YES
+LIBCGI_LICENSE = LGPL-2.1+, MIT (base64.c)
+LIBCGI_LICENSE_FILES = LICENSES/LGPL-2.1.txt LICENSES/MIT.txt
+
+$(eval $(cmake-package))