Minor refactor to headers to include missing c-std headers

src/db_column.h

@@ -2,7 +2,9 @@
 #define H__DB_COLUMN__
 
 #include <stdint.h>
+#include <stddef.h>
 #include <mysql.h>
+
 #include "db_connection.h"
 
 enum e_column_type_t {
@@ -39,7 +41,7 @@ struct column_data_t {
   uint8_t isBlob      :1;
   uint8_t isTimestamp :1;
 
-  union u_data {
+  union {
     void *vptr;
 
     int8_t *ptr_int8;

src/db_connection.h

@@ -6,7 +6,6 @@
 
 #define SQCONN(s) (MYSQL *)s->conn
 
-
 struct stored_conn_t {
   int conn_id;
   char *name;

src/db_query.h

@@ -1,6 +1,9 @@
 #ifndef H__DB_QUERY__
 #define H__DB_QUERY__
 
+#include <stdint.h>
+#include <stddef.h>
+
 #include "db_connection.h"
 #include "db_column.h"
 

src/db_value.h

@@ -1,6 +1,10 @@
 #ifndef H__DB_VALUE__
 #define H__DB_VALUE__
 
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
 #include "db_column.h"
 
 char *db_value(char **str, size_t *len, e_column_type type, uint32_t n_args, ...);

src/db_where-builder.h

@@ -2,8 +2,12 @@
 #define H__DB_WHERE_BUILDER__
 
 #include <stddef.h>
+#include <stdint.h>
+#include <stdarg.h>
+
 #include "db_column.h"
 
+
 enum e_where_logic_t {
   UNK,
   CLAUSE,