Add optimized neon strchr implementation based on newlib

Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>
Change-Id: I276ff0f879e733a1115456247e1342b9c5a09015
diff --git a/libc/arch-arm64/generic-neon/generic-neon.mk b/libc/arch-arm64/generic-neon/generic-neon.mk
index 2cbe3cf..6cbe335 100644
--- a/libc/arch-arm64/generic-neon/generic-neon.mk
+++ b/libc/arch-arm64/generic-neon/generic-neon.mk
@@ -2,6 +2,7 @@
     arch-arm64/generic/bionic/memcmp.S \
     arch-arm64/generic/bionic/memmove.S \
     arch-arm64/generic/bionic/memset.S \
+    arch-arm64/generic/bionic/strchr.S \
     arch-arm64/generic/bionic/strcmp.S \
     arch-arm64/generic/bionic/strlen.S \
     arch-arm64/generic/bionic/strncmp.S \