Remove duplicate item
This elimates the makefile warning at the beginning of each build:
libc_common_intermediates/arch-arm/syscalls/eventfd.o' given more than once in the same rule.
Change-Id: I25cc0c373d55b5036dd17811a595c097fd6ca69a
diff --git a/libc/arch-arm/syscalls.mk b/libc/arch-arm/syscalls.mk
index c3cf785..ba78c18 100644
--- a/libc/arch-arm/syscalls.mk
+++ b/libc/arch-arm/syscalls.mk
@@ -175,4 +175,3 @@
syscall_src += arch-arm/syscalls/eventfd.S
syscall_src += arch-arm/syscalls/__set_tls.S
syscall_src += arch-arm/syscalls/cacheflush.S
-syscall_src += arch-arm/syscalls/eventfd.S