tools: strip trailing whitespaces/newline from dump_machine

In components/xtensa/project_include.cmake ${CMAKE_C_COMPILER} -dumpmachine
is called, but the output has newline.

Before
---8<--
-- Compiler supported targets: xtensa-esp32s3-elf

-- App "blink" version: 1.2.3
---8<--

After
---8<--
-- Compiler supported targets: xtensa-esp32s3-elf
-- App "blink" version: 1.2.3
---8<--

Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>

components/xtensa/project_include.cmake

@@ -10,6 +10,7 @@ else()
     execute_process(
         COMMAND ${CMAKE_C_COMPILER} -dumpmachine
         OUTPUT_VARIABLE dump_machine
+        OUTPUT_STRIP_TRAILING_WHITESPACE
     )
 endif()
 message(STATUS "Compiler supported targets: ${dump_machine}")