pkg/ruy: add support for matrix multiplication library

pkg/ruy/Kconfig

@@ -0,0 +1,9 @@
+# Copyright (c) 2022 Inria
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+config PACKAGE_RUY
+    bool "The ruy matrix multiplication library"
+    depends on TEST_KCONFIG

pkg/ruy/Makefile

@@ -0,0 +1,9 @@
+PKG_NAME=ruy
+PKG_URL=https://github.com/google/ruy
+PKG_VERSION=7ef39c5745a61f43071e699c6a96da41701ae59f
+PKG_LICENSE=Apache 2.0
+
+include $(RIOTBASE)/pkg/pkg.mk
+
+all:
+	@:

pkg/ruy/Makefile.dep

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+FEATURES_REQUIRED += cpp
+
+USEMODULE += cpp11-compat

pkg/ruy/Makefile.include

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+INCLUDES += -I$(PKGDIRBASE)/ruy
+
+PSEUDOMODULES += ruy
+
+CFLAGS += -DTHIRD_PARTY_RUY_RUY_GTEST_WRAPPER_H_

pkg/ruy/doc.txt

@@ -0,0 +1,11 @@
+/**
+ * @defgroup pkg_ruy   The ruy matrix multiplication library
+ * @ingroup  pkg
+ * @brief    ruy is a matrix multiplication library
+ *
+ * # License
+ *
+ * Licensed under Apache 2.0.
+ *
+ * @see      https://github.com/google/ruy
+ */

pkg/ruy/ruy.mk

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+MODULE = ruy
+
+SRCXXEXT = cc
+SRCXXEXCLUDE = $(wildcard *_test.$(SRCXXEXT))
+SRCXXEXCLUDE += benchmark.cc pack_%.cc test_%.cc
+
+CFLAGS += -Wno-unused-variable
+
+include $(RIOTBASE)/Makefile.base