Update sources.bp after upstream merge

Bug: 190084016
Test: m USE_HOST_MUSL=true host-native
Change-Id: I474d2d29323360da79ac998b15628b2c1c31e7a9
diff --git a/sources.bp b/sources.bp
index c9ef3c2..bb55ddb 100644
--- a/sources.bp
+++ b/sources.bp
@@ -990,6 +990,7 @@
         "src/stdlib/llabs.c",
         "src/stdlib/lldiv.c",
         "src/stdlib/qsort.c",
+        "src/stdlib/qsort_nr.c",
         "src/stdlib/strtod.c",
         "src/stdlib/strtol.c",
         "src/stdlib/wcstod.c",