arm: fix static linking issues

As reported by Buildroot developers these files causing static
linking issues. The original contribution with the ARM unwind-resume
rework and GNU libc sync was made before the combined libc change.
But the patch was applied later, after the libc change and
it seems the test coverage for static linking didn't catch it in
the regression testing. Remove the files.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>

libpthread/nptl/sysdeps/arm/pt-arm-unwind-resume.c

@@ -1,2 +0,0 @@
-__asm__ (".set __libgcc_s_init, pthread_cancel_init");
-#include <arm-unwind-resume.c>

libpthread/nptl/sysdeps/arm/rt-arm-unwind-resume.c

@@ -1 +0,0 @@
-#include <arm-unwind-resume.c>