Decommision src_common prior to reintroducing it for files common between eth and plugins

src/mem_utils.h

@@ -0,0 +1,16 @@
+#ifndef MEM_UTILS_H_
+#define MEM_UTILS_H_
+
+#ifdef HAVE_DYN_MEM_ALLOC
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define MEM_ALLOC_AND_ALIGN_TYPE(type) mem_alloc_and_align(sizeof(type), __alignof__(type))
+
+char *mem_alloc_and_format_uint(uint32_t value, uint8_t *const written_chars);
+void *mem_alloc_and_align(size_t size, size_t alignment);
+
+#endif  // HAVE_DYN_MEM_ALLOC
+
+#endif  // MEM_UTILS_H_