Add extra version information to avrdude output

Some downstream projects build avrdude and want to add their
own version information to the avrdude version to distinguish
their builds from others.

This adds a clean way to do that without needing to patch the
avrdude sources, for both cmake and automake based builds:

    cmake -DEXTRA_VERSION:STRING=-arduino.1-rc1
    ../configure EXTRA_VERSION=-arduino.1-rc1

After building avrdude, the last line of "avrdude -?" will now
look similar to the following, depending on whether you are
building an avrdude git checkout or an avrdude release tarball:

    avrdude version 8.0-20240901-arduino.1-rc1 (30e19f2), https://github.com/avrdudes/avrdude
    avrdude version 8.1-arduino.1-rc1 (30e19f2), https://github.com/avrdudes/avrdude

CMakeLists.txt

@@ -49,7 +49,7 @@ include(FindPackageMessage)
 include(GNUInstallDirs)
 
 set(CONFIG_DIR "${CMAKE_INSTALL_FULL_SYSCONFDIR}")
-set(AVRDUDE_FULL_VERSION ${CMAKE_PROJECT_VERSION})
+set(AVRDUDE_FULL_VERSION "${CMAKE_PROJECT_VERSION}${EXTRA_VERSION_SUFFIX}")
 
 # =====================================
 # Get Git commit info
@@ -91,7 +91,7 @@ if(Git_FOUND)
 
     # If the commit is not tagged, include the date and commit hash in the full version string.
     if(NOT GIT_COMMIT_HASH STREQUAL GIT_TAG_HASH)
-        set(AVRDUDE_FULL_VERSION "${CMAKE_PROJECT_VERSION}-${GIT_COMMIT_DATE} (${GIT_COMMIT_HASH})")
+        set(AVRDUDE_FULL_VERSION "${CMAKE_PROJECT_VERSION}-${GIT_COMMIT_DATE}${EXTRA_VERSION_SUFFIX} (${GIT_COMMIT_HASH})")
     endif()
 endif()
 
@@ -373,6 +373,7 @@ if (DEBUG_CMAKE)
     message(STATUS "CMAKE_FIND_ROOT_PATH: ${CMAKE_FIND_ROOT_PATH}")
     message(STATUS "CMAKE_C_COMPILER: ${CMAKE_C_COMPILER}")
     message(STATUS "CONFIG_DIR: ${CONFIG_DIR}")
+    message(STATUS "EXTRA_VERSION_SUFFIX: ${EXTRA_VERSION_SUFFIX}")
     message(STATUS "AVRDUDE_FULL_VERSION: ${AVRDUDE_FULL_VERSION}")
     message(STATUS "USE_EXTERNAL_LIBS: ${USE_EXTERNAL_LIBS}")
     message(STATUS "USE_LIBUSBWIN32: ${USE_LIBUSBWIN32}")

src/configure.ac

@@ -80,11 +80,13 @@ AC_MSG_RESULT([$PACKAGE_VERSION])
 dnl Compose the full version message mirroring the cmake one, inform
 dnl about it and pass it on to avrdude.conf and the "avrdude -?"
 dnl version message
+AC_ARG_VAR([EXTRA_VERSION_SUFFIX],
+           [extra version information to be appended to the version])
 AC_MSG_CHECKING([versioninfo derived AVRDUDE_FULL_VERSION])
 if test "x$GIT_COMMIT_HASH" = "x$GIT_TAG_HASH"; then
-	AVRDUDE_FULL_VERSION="$PACKAGE_VERSION"
+	AVRDUDE_FULL_VERSION="$PACKAGE_VERSION$EXTRA_VERSION_SUFFIX"
 else
-	AVRDUDE_FULL_VERSION="$PACKAGE_VERSION ($GIT_COMMIT_HASH)"
+	AVRDUDE_FULL_VERSION="$PACKAGE_VERSION$EXTRA_VERSION_SUFFIX ($GIT_COMMIT_HASH)"
 fi
 AC_MSG_RESULT([$AVRDUDE_FULL_VERSION])
 AC_DEFINE_UNQUOTED([AVRDUDE_FULL_VERSION], ["$AVRDUDE_FULL_VERSION"],