Add stpcpy assembler version.

For generic, continue to use the C version of the code.

Bug: 13746695
Change-Id: I77426a70b06131f2373bb51265bea1240bb3f101
diff --git a/libc/arch-arm/krait/krait.mk b/libc/arch-arm/krait/krait.mk
index 631ab68..1bb7b0a 100644
--- a/libc/arch-arm/krait/krait.mk
+++ b/libc/arch-arm/krait/krait.mk
@@ -7,6 +7,7 @@
 
 # Use cortex-a15 versions of strcat/strcpy/strlen and standard memmove
 libc_bionic_src_files_arm += \
+    arch-arm/cortex-a15/bionic/stpcpy.S \
     arch-arm/cortex-a15/bionic/strcat.S \
     arch-arm/cortex-a15/bionic/strcpy.S \
     arch-arm/cortex-a15/bionic/strlen.S \