Add the dl_iterate_phdr function to libdl for arm.

Bug: 8410085

Merge from internal master.

(cherry-picked from cb491bc66dc0abc145930b09086eb9189a30f6c2)

Change-Id: I94ed51bc5d4c626df7552c0e85c31ccee2d6568f
diff --git a/libc/arch-arm/arm.mk b/libc/arch-arm/arm.mk
index e87ef38..5f2443f 100644
--- a/libc/arch-arm/arm.mk
+++ b/libc/arch-arm/arm.mk
@@ -21,10 +21,11 @@
 # These are used by the static and dynamic versions of the libc
 # respectively.
 _LIBC_ARCH_STATIC_SRC_FILES := \
-    arch-arm/bionic/exidx_static.c
+    arch-arm/bionic/exidx_static.c \
+    bionic/dl_iterate_phdr_static.c \
 
 _LIBC_ARCH_DYNAMIC_SRC_FILES := \
-    arch-arm/bionic/exidx_dynamic.c
+    arch-arm/bionic/exidx_dynamic.c \
 
 # Remove the C++ fortify function implementations for which there is an
 # arm assembler version.