Add gtest (#4877)

* Add gtest
* fix URLS

packages/gtest.rb

+require 'package'
+
+class Gtest < Package
+  description 'Google Test - C++ testing utility'
+  version '1.10.0-389c'
+  compatibility 'all'
+  source_url 'https://github.com/google/googletest/archive/389cb68b87193358358ae87cc56d257fd0d80189.zip'
+  source_sha256 '763e20249e76417bed7ebc44aa85fedf5fbac6f9fb6d30bddb628ab07ebf04f5'
+
+  binary_url ({
+     aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/gtest-1.10.0-389c-chromeos-armv7l.tar.xz',
+      armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/gtest-1.10.0-389c-chromeos-armv7l.tar.xz',
+        i686: 'https://dl.bintray.com/chromebrew/chromebrew/gtest-1.10.0-389c-chromeos-i686.tar.xz',
+      x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/gtest-1.10.0-389c-chromeos-x86_64.tar.xz',
+  })
+  binary_sha256 ({
+     aarch64: '4c1dde1b6562fca74a35cd29f627d57ce06e6fb77b1873c34be7e75200ce5826',
+      armv7l: '4c1dde1b6562fca74a35cd29f627d57ce06e6fb77b1873c34be7e75200ce5826',
+        i686: '111db3afcc8f26d2a9e2d04221c99a8514d786da64fdc06349ea3665eaa3ea86',
+      x86_64: '560e28bcf87d89c9c076f0d094c8cfb461392e68679b7d833038a18c4d3c2fa2',
+  })
+
+
+  case ARCH
+  when 'aarch64','armv7l'
+    ARCH_C_FLAGS = '-march=armv7-a -mcpu=cortex-a15 -mfloat-abi=hard -I/usr/local/include/c++/v1'
+    ARCH_CXX_FLAGS = '-march=armv7-a -mcpu=cortex-a15 -mfloat-abi=hard -I/usr/local/include/c++/v1'
+  when 'i686','x86_64'
+    ARCH_C_FLAGS = ''
+    ARCH_CXX_FLAGS = ''
+  end
+  
+    def self.build
+      system "sed -E \"s|(GOOGLETEST_VERSION) [0-9\\.]+|\\1 1.10.0|\" -i CMakeLists.txt"
+      system "env LIBRARY_PATH=#{CREW_LIB_PREFIX} cmake -G Ninja \
+       -DCMAKE_INSTALL_PREFIX=#{CREW_PREFIX}  \
+       -DCMAKE_BUILD_TYPE=Release \
+       -Dgtest_build_tests=OFF \
+       -DCMAKE_C_COMPILER=$(which clang) \
+       -DCMAKE_CXX_COMPILER=$(which clang++) \
+       -DCMAKE_C_FLAGS='#{ARCH_C_FLAGS}' \
+       -DCMAKE_CXX_FLAGS='#{ARCH_CXX_FLAGS}' \
+       -DCMAKE_LINKER=$(which lld) \
+       -DCMAKE_AR=$(which llvm-ar) \
+       -DCMAKE_RANLIB=$(which llvm-ranlib) \
+       -Bbuilddir"
+      system 'ninja -C builddir'
+    end
+    
+    def self.install
+      system "DESTDIR=#{CREW_DEST_DIR} ninja -C builddir install"
+    end
+end