upgrade installer to support the latest changes to chloride

install.ar

@@ -1,9 +1,11 @@
 import "build" as build
+import "file" as file
+
+file.mkdir("src/native/bin")
 
 build.Compiler("c")
   .shared()
   .source("src/native/sqlite/sqlite3.c", "src/native/sqlite/shell.c", "src/native/lib.c")
-  .library("pthread", "dl")
+  .library_if({"linux": ["pthread", "dl"], "darwin": ["pthread"], "windows": []})
-  .flag("-fPIC")
+  .output("src/native/bin/sqlite")
-  .output("src/native/bin/sqlite.so")
   .build()

src/init.ar

@@ -4,7 +4,7 @@
 
 import "template.ar" expose sql, SQL_QUERY
 
-let __native__ = load_native_code(program.file.directory+"native/bin/sqlite"+platform.lib_ext)
+let __native__ = load_native_code(`$(program.file.directory)native/bin/$(platform.lib_prefix)sqlite$(platform.lib_ext)`)
 
 class SqliteError(Exception) null