Merge branch 'fix/md5_enabled_fix' into 'master'

fix: Fix MD5 option handling

Closes ESF-143

See merge request espressif/esp-serial-flasher!110

Author: DNedic

CMakeLists.txt

@@ -52,7 +52,9 @@ if (DEFINED SERIAL_FLASHER_INTERFACE_UART OR CONFIG_SERIAL_FLASHER_INTERFACE_UAR
     list(APPEND defs
         SERIAL_FLASHER_INTERFACE_UART
     )
-    add_option(MD5_ENABLED false)
+    if (DEFINED MD5_ENABLED OR CONFIG_SERIAL_FLASHER_MD5_ENABLED)
+        list(APPEND defs MD5_ENABLED=1)
+    endif()
 
 elseif(DEFINED SERIAL_FLASHER_INTERFACE_USB OR CONFIG_SERIAL_FLASHER_INTERFACE_USB STREQUAL "y")
     list(APPEND srcs
@@ -62,7 +64,9 @@ elseif(DEFINED SERIAL_FLASHER_INTERFACE_USB OR CONFIG_SERIAL_FLASHER_INTERFACE_U
     list(APPEND defs
         SERIAL_FLASHER_INTERFACE_USB
     )
-    add_option(MD5_ENABLED false)
+    if (DEFINED MD5_ENABLED OR CONFIG_SERIAL_FLASHER_MD5_ENABLED)
+        list(APPEND defs MD5_ENABLED=1)
+    endif()
 
 elseif(DEFINED SERIAL_FLASHER_INTERFACE_SPI OR CONFIG_SERIAL_FLASHER_INTERFACE_SPI STREQUAL "y")
     list(APPEND srcs