Work around thrust/memory.h circular include (#1634)

* Work around thrust/memory.h circular include

Add `#include <thrust/detail/malloc_and_free_fwd.h>` to
`thrust/thrust/system/detail/generic/memory.inl` to work around a
circular include dependency that was resulting in errors about
`thrust::malloc` not being defined.  The errors were seen with both G++
and NVC++ when using the OpenMP back end.

* [pre-commit.ci] auto code formatting

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

thrust/thrust/system/detail/generic/memory.inl

@@ -26,6 +26,7 @@
 #  pragma system_header
 #endif // no system header
 
+#include <thrust/detail/malloc_and_free_fwd.h>
 #include <thrust/detail/static_assert.h>
 #include <thrust/detail/type_traits/pointer_traits.h>
 #include <thrust/system/detail/adl/malloc_and_free.h>