initial buildroot for linux 5.15

package/mpc/Config.in

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+config BR2_PACKAGE_MPC
+	bool "mpc"
+	select BR2_PACKAGE_MPFR
+	select BR2_PACKAGE_GMP
+	help
+	  Mpc is a C library for the arithmetic of complex numbers with
+	  arbitrarily high precision and correct rounding of the result.
+	  It is built upon and follows the same principles as Mpfr.
+
+	  http://www.multiprecision.org/

package/mpc/mpc.hash

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+# Locally calculated
+sha256  17503d2c395dfcf106b622dc142683c1199431d095367c6aacba6eec30340459  mpc-1.2.1.tar.gz
+sha256  da7eabb7bafdf7d3ae5e9f223aa5bdc1eece45ac569dc21b3b037520b4464768  COPYING.LESSER

package/mpc/mpc.mk

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+################################################################################
+#
+# mpc
+#
+################################################################################
+
+MPC_VERSION = 1.2.1
+MPC_SITE = $(BR2_GNU_MIRROR)/mpc
+MPC_LICENSE = LGPL-3.0+
+MPC_LICENSE_FILES = COPYING.LESSER
+MPC_INSTALL_STAGING = YES
+MPC_DEPENDENCIES = gmp mpfr
+HOST_MPC_DEPENDENCIES = host-gmp host-mpfr
+
+$(eval $(autotools-package))
+$(eval $(host-autotools-package))