Fixes newline in version.txt (#28)

Fixes #25

Author: RobertWilbrandt

Arduino/System/BoardToolchain.cmake

@@ -116,6 +116,7 @@ function (SetupBoardToolchain boards_namespace board_id generate_dir)
 		EXISTS "${ARDUINO_INSTALL_PATH}/lib/version.txt")
 		set(_path "${ARDUINO_INSTALL_PATH}")
 		file(READ "${ARDUINO_INSTALL_PATH}/lib/version.txt" _version)
+                string(STRIP "${_version}" _version)
 	else()
 		set(_path "${ARDUINO_TOOLCHAIN_DIR}")
 		set(_version "${ARDUINO_TOOLCHAIN_VERSION}.0")