Use pthread_kill() in raise()

raise() should use pthread_kill() in a pthreads environment.
For bionic this means it should always be used.

Change-Id: Ic679272b664d2b8a7068b628fb83a9f7395c441f
diff --git a/libc/Android.mk b/libc/Android.mk
index dc2b331..e58d4fb 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -199,7 +199,6 @@
 	bionic/ptsname_r.c \
 	bionic/pututline.c \
 	bionic/pwrite.c \
-	bionic/raise.c \
 	bionic/realpath.c \
 	bionic/reboot.c \
 	bionic/recv.c \
@@ -282,6 +281,7 @@
     bionic/__memcpy_chk.cpp \
     bionic/__memmove_chk.cpp \
     bionic/__memset_chk.cpp \
+    bionic/raise.cpp \
     bionic/__set_errno.cpp \
     bionic/setlocale.cpp \
     bionic/__strcat_chk.cpp \