Revert unneeded part of gcc -Og change

* configure.ac (DEFINE_KEY_OPS_AS_MACROS):
Undo this recent change to configure.ac; it’s not needed.

configure.ac

@@ -938,13 +938,6 @@ if test "$ac_test_CFLAGS" != set; then
   esac
 fi
 
-case "$GCC, $CFLAGS " in
-  yes,*' -Og '*)
-    AC_DEFINE([DEFINE_KEY_OPS_AS_MACROS], 1,
-      [Define to 1 if key low-level operations should be C macros
-       instead of inline functions.])
-esac
-
 # gl_GCC_VERSION_IFELSE([major], [minor], [run-if-found], [run-if-not-found])
 # ---------------------------------------------------------------------------
 # If $CPP is gcc-MAJOR.MINOR or newer, then run RUN-IF-FOUND.