Add cppcheck configuration files

Author: kgryte

etc/cppcheck/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2021 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# cppcheck
+
+> [cppcheck][cppcheck] configuration.
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+This directory contains [cppcheck][cppcheck] configuration files.
+
+</section>
+
+<!-- /.intro -->
+
+<!-- Section to include notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[cppcheck]: http://cppcheck.sourceforge.net/
+
+</section>
+
+<!-- /.links -->

etc/cppcheck/suppressions.benchmarks.txt

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+duplicateExpression
+missingIncludeSystem
+unmatchedSuppression
+variableScope

etc/cppcheck/suppressions.examples.txt

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+duplicateExpression
+missingIncludeSystem
+unmatchedSuppression
+variableScope

etc/cppcheck/suppressions.tests_fixtures.txt

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+duplicateExpression
+missingIncludeSystem
+unmatchedSuppression
+variableScope

etc/cppcheck/suppressions.txt

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+duplicateExpression
+invalidPointerCast
+missingIncludeSystem
+unmatchedSuppression
+variableScope