Add compilation target android-arm64

makefile

@@ -48,6 +48,7 @@ projgen: ## Generate project files for all configurations.
 	$(GENIE) --with-tools --with-combined-examples --with-shared-lib --xcode=ios           xcode8
 	$(GENIE)              --with-combined-examples --with-shared-lib --gcc=freebsd         gmake
 	$(GENIE)              --with-combined-examples                   --gcc=android-arm     gmake
+	$(GENIE)              --with-combined-examples                   --gcc=android-arm64   gmake
 	$(GENIE)              --with-combined-examples                   --gcc=android-x86     gmake
 	$(GENIE)              --with-combined-examples                   --gcc=asmjs           gmake
 	$(GENIE)              --with-combined-examples                   --gcc=ios-arm         gmake
@@ -68,6 +69,14 @@ android-arm-release: .build/projects/gmake-android-arm ## Build - Android ARM Re
 	$(MAKE) -R -C .build/projects/gmake-android-arm config=release
 android-arm: android-arm-debug android-arm-release ## Build - Android ARM Debug and Release
 
+.build/projects/gmake-android-arm64:
+	$(GENIE) --gcc=android-arm64 gmake
+android-arm64-debug: .build/projects/gmake-android-arm64 ## Build - Android ARM64 Debug
+	$(MAKE) -R -C .build/projects/gmake-android-arm64 config=debug
+android-arm64-release: .build/projects/gmake-android-arm64 ## Build - Android ARM64 Release
+	$(MAKE) -R -C .build/projects/gmake-android-arm64 config=release
+android-arm64: android-arm64-debug android-arm64-release ## Build - Android ARM64 Debug and Release
+
 .build/projects/gmake-android-x86:
 	$(GENIE) --gcc=android-x86 gmake
 android-x86-debug: .build/projects/gmake-android-x86 ## Build - Android x86 Debug and Release