add release snippet

docs/markdown/snippets/d_compiler_checks.md

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+## D compiler checks
+
+Some compiler checks are implemented for D:
+ - `run`
+ - `sizeof`
+ - `has_header` (to check if a module is present)
+ - `alignment`
+
+Example:
+
+```meson
+ptr_size = meson.get_compiler('d').sizeof('void*')
+```