serdes: simplify handling of basic types

This commit removes a macro, and fixes compilation errors on
certain platforms such as NetBSD 8.2.

Refs: nodejs/node#34510
Fixes: #145

include/wasi_serdes.h

@@ -9,17 +9,16 @@
   void uvwasi_serdes_write_##name(void* ptr, size_t offset, type value);      \
   type uvwasi_serdes_read_##name(const void* ptr, size_t offset);             \
 
-#define BASIC_TYPE(type) BASIC_TYPE_(type, type)
 #define BASIC_TYPE_UVWASI(type) BASIC_TYPE_(type, uvwasi_##type)
 
 #define UVWASI_SERDES_SIZE_uint8_t sizeof(uint8_t)
-BASIC_TYPE(uint8_t)
+BASIC_TYPE_(uint8_t, uint8_t)
 #define UVWASI_SERDES_SIZE_uint16_t sizeof(uint16_t)
-BASIC_TYPE(uint16_t)
+BASIC_TYPE_(uint16_t, uint16_t)
 #define UVWASI_SERDES_SIZE_uint32_t sizeof(uint32_t)
-BASIC_TYPE(uint32_t)
+BASIC_TYPE_(uint32_t, uint32_t)
 #define UVWASI_SERDES_SIZE_uint64_t sizeof(uint64_t)
-BASIC_TYPE(uint64_t)
+BASIC_TYPE_(uint64_t, uint64_t)
 
 #define UVWASI_SERDES_SIZE_advice_t sizeof(uvwasi_advice_t)
 BASIC_TYPE_UVWASI(advice_t)