Generate "current" API level.

Support for using this coming in an upcoming patch.

Test: nose2
      readelf to check the following:
      * bsd_signal unversioned before current
      * bsd_signal versioned in current
      * catclose missing before current
      * catclose present and versioned in current
Bug: None
Change-Id: I861862161426d3ec5b530e3156d3a8ae96fed468
diff --git a/cc/androidmk.go b/cc/androidmk.go
index a4d7fcf..50c183e 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -18,7 +18,6 @@
 	"fmt"
 	"io"
 	"path/filepath"
-	"strconv"
 	"strings"
 
 	"android/soong/android"
@@ -217,7 +216,7 @@
 }
 
 func (c *stubDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
-	ret.SubName = "." + strconv.Itoa(c.properties.ApiLevel)
+	ret.SubName = "." + c.properties.ApiLevel
 	ret.Class = "SHARED_LIBRARIES"
 
 	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) error {