c-stdaux: revert "generic: use _c_likely_() in c_assert()"

The change that c_assert() now uses a runtime construct
_c_boolean_expr() causes a "-Wsometimes-uninitialized" warning
with clang ([1]). Revert the patch for now.

This reverts c-stdaux commit [2].

[1] https://github.com/c-util/c-stdaux/pull/11#issuecomment-1331233011
[2] 2cda8dc53a

src/c-stdaux/src/c-stdaux-generic.h

@@ -299,7 +299,7 @@ extern "C" {
  * optimize it away.
  */
 #define c_assert(_x) (                                                          \
-                _c_likely_(_x)                                                  \
+                (bool)(_x)                                                      \
                         ? assert(true && #_x)                                   \
                         : assert(false && #_x)                                  \
         )