Add muparser package

Add pre-built binaries

packages/muparser.rb

+require 'package'
+
+class Muparser < Package
+  description 'muParser is an extensible high performance math expression parser library written in C++.'
+  homepage 'http://beltoforion.de/article.php?a=muparser'
+  version '2.6.1'
+  source_url 'https://github.com/beltoforion/muparser/archive/v2.2.6.1.tar.gz'
+  source_sha256 'd2562853d972b6ddb07af47ce8a1cdeeb8bb3fa9e8da308746de391db67897b3'
+
+  binary_url ({
+    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/muparser-2.6.1-chromeos-armv7l.tar.xz',
+     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/muparser-2.6.1-chromeos-armv7l.tar.xz',
+       i686: 'https://dl.bintray.com/chromebrew/chromebrew/muparser-2.6.1-chromeos-i686.tar.xz',
+     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/muparser-2.6.1-chromeos-x86_64.tar.xz',
+  })
+  binary_sha256 ({
+    aarch64: '4fce29777174db06a8b8ced631ed78b16f2ccbee130cc5a72ff80035ee9b788e',
+     armv7l: '4fce29777174db06a8b8ced631ed78b16f2ccbee130cc5a72ff80035ee9b788e',
+       i686: '7491c925d7a81eb17bbb1746aa3b6bfee18c6e62e4a43a5bbde4e7b620fee76c',
+     x86_64: 'f00187a350bb837e95c946ed8a85fcfa47ee62e34891155dd4a9f255aa529b39',
+  })
+
+  def self.build
+    system "./configure \
+           --prefix=#{CREW_PREFIX} \
+           --libdir=#{CREW_LIB_PREFIX} \
+           --enable-shared=yes \
+           --enable-samples=no \
+           --enable-debug=no"
+    system 'make'
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end