Remove undef CHAR

There's no justification behind as to why this should be.

Author: NattyNarwhal

ext/odbc/php_odbc_includes.h

@@ -25,29 +25,13 @@
 
 #if defined(HAVE_IODBC) /* iODBC library */
 
-#ifdef CHAR
-#undef CHAR
-#endif
-
-#ifdef SQLCHAR
-#undef SQLCHAR
-#endif
-
 #define ODBC_TYPE "iODBC"
 #include <sql.h>
 #include <sqlext.h>
 #include <iodbcext.h>
 
 #elif defined(HAVE_UNIXODBC) /* unixODBC library */
 
-#ifdef CHAR
-#undef CHAR
-#endif
-
-#ifdef SQLCHAR
-#undef SQLCHAR
-#endif
-
 #define ODBC_TYPE "unixODBC"
 #undef ODBCVER
 #include <sql.h>