esp32: Enable compressed error messages by default.

Reduces firmware size by about 3300 bytes.

Signed-off-by: Damien George <damien@micropython.org>
diff --git a/ports/esp32/esp32_common.cmake b/ports/esp32/esp32_common.cmake
index dedef6d..a982724 100644
--- a/ports/esp32/esp32_common.cmake
+++ b/ports/esp32/esp32_common.cmake
@@ -28,6 +28,11 @@
     endif()
 endif()
 
+# Enable error text compression by default.
+if(NOT MICROPY_ROM_TEXT_COMPRESSION)
+    set(MICROPY_ROM_TEXT_COMPRESSION ON)
+endif()
+
 # Include core source components.
 include(${MICROPY_DIR}/py/py.cmake)