libm: Add nanf() and tgammaf() implementations.

Requested by b/3370708 to export these through RenderScript.

Change-Id: I1ae69f87a1ad4765b2dee8e4a6f2f3a6eb7c5ad4
diff --git a/libm/Android.mk b/libm/Android.mk
index 28e8f33..29c75a2 100644
--- a/libm/Android.mk
+++ b/libm/Android.mk
@@ -117,6 +117,7 @@
 	src/s_lroundf.c \
 	src/s_lroundl.c \
 	src/s_modff.c \
+	src/s_nan.c \
 	src/s_nearbyint.c \
 	src/s_nextafter.c \
 	src/s_nextafterf.c \
@@ -138,6 +139,7 @@
 	src/s_tanf.c \
 	src/s_tanh.c \
 	src/s_tanhf.c \
+	src/s_tgammaf.c \
 	src/s_trunc.c \
 	src/s_truncf.c \
 	src/s_truncl.c \