Added API version for sqlite/pg binding

Author: Skarsnik

lib/DBDish/Pg/Native.pm6

@@ -5,7 +5,7 @@ use NativeCall;
 
 unit module DBDish::Pg::Native;
 
-constant LIB = %*ENV<DBIISH_PG_LIB> || 'libpq';
+constant LIB = %*ENV<DBIISH_PG_LIB> || ('libpq', 5);
 
 #------------ Pg library functions in alphabetical order ------------
 

lib/DBDish/SQLite/Native.pm6

@@ -45,7 +45,7 @@ enum SQLITE_TYPE is export (
     SQLITE_NULL    => 5
 );
 
-constant LIB = %*ENV<DBIISH_SQLITE_LIB> || 'libsqlite3';
+constant LIB = %*ENV<DBIISH_SQLITE_LIB> || ('libsqlite3' , 0);
 
 sub sqlite3_errmsg(OpaquePointer $handle)
     returns Str