Add keystone port (#3273)

* Add keystone port

* [keystone] Small portfile simplifications

ports/keystone/CONTROL

@@ -0,0 +1,3 @@
+Source: keystone
+Version: 0.9.1
+Description: Lightweight multi-platform, multi-architecture assembler framework

ports/keystone/portfile.cmake

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+include(vcpkg_common_functions)
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO keystone-engine/keystone
+    REF 0.9.1
+    SHA512 3bd9c3793d5862a0a8628b52da381625e62445f661dbd5ed715723e7d9db01ce3f9586e5ca0a5cc71e8ceb6c912050f5c28e3ccd540e72c8abcfd2f0d1bbae17
+    HEAD_REF master
+)
+
+vcpkg_find_acquire_program(PYTHON2)
+
+string(COMPARE EQUAL "${VCPKG_LIBRARY_LINKAGE}" "static" KEYSTONE_BUILD_STATIC)
+string(COMPARE EQUAL "${VCPKG_LIBRARY_LINKAGE}" "dynamic" KEYSTONE_BUILD_SHARED)
+
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}
+    PREFER_NINJA
+    OPTIONS
+        -DKEYSTONE_BUILD_STATIC=${KEYSTONE_BUILD_STATIC}
+        -DKEYSTONE_BUILD_SHARED=${KEYSTONE_BUILD_SHARED}
+        -DPYTHON_EXECUTABLE=${PYTHON2}
+
+        # Add support for only a subset of architectures
+        #-DLLVM_TARGETS_TO_BUILD="AArch64;X86"
+)
+
+vcpkg_install_cmake()
+vcpkg_copy_pdbs()
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)
+file(GLOB EXES ${CURRENT_PACKAGES_DIR}/bin/*.exe ${CURRENT_PACKAGES_DIR}/debug/bin/*.exe)
+if(EXES)
+    file(REMOVE ${EXES})
+endif()
+if(VCPKG_LIBRARY_LINKAGE STREQUAL "static")
+    file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/bin ${CURRENT_PACKAGES_DIR}/debug/bin)
+else()
+    # Move DLLs
+    file(GLOB DLLS ${CURRENT_PACKAGES_DIR}/lib/*.dll)
+    file(COPY ${DLLS} DESTINATION ${CURRENT_PACKAGES_DIR}/bin)
+    file(REMOVE ${DLLS})
+    file(GLOB DLLS ${CURRENT_PACKAGES_DIR}/debug/lib/*.dll)
+    file(COPY ${DLLS} DESTINATION ${CURRENT_PACKAGES_DIR}/debug/bin)
+    file(REMOVE ${DLLS})
+endif()
+
+# Handle copyright
+file(INSTALL ${SOURCE_PATH}/COPYING
+    DESTINATION ${CURRENT_PACKAGES_DIR}/share/keystone 
+    RENAME copyright
+)