patch 8.2.3037: configure reports libcanberra when checking for libsodium

Problem:    Configure reports libcanberra when checking for libsodium.
Solution:   Adjust the message. (Ozaki Kiichi, closes #8435)
diff --git a/src/configure.ac b/src/configure.ac
index 84b54db..5ec9557 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -3792,7 +3792,7 @@
     libsodium_lib=-lsodium
     libsodium_cflags=
   fi
-  AC_MSG_CHECKING(for libcanberra)
+  AC_MSG_CHECKING(for libsodium)
   ac_save_CFLAGS="$CFLAGS"
   ac_save_LIBS="$LIBS"
   CFLAGS="$CFLAGS $libsodium_cflags"