selftests/resctrl: fix clang build failure: use LOCAL_HDRS

First of all, in order to build with clang at all, one must first apply
Valentin Obst's build fix for LLVM [1]. Once that is done, then when
building with clang, via:

make LLVM=1 -C tools/testing/selftests

...the following error occurs:

clang: error: cannot specify -o when generating multiple output files

This is because clang, unlike gcc, won't accept invocations of this
form:

clang file1.c header2.h

Fix this by using selftests/lib.mk facilities for tracking local header
file dependencies: add them to LOCAL_HDRS, leaving only the .c files to
be passed to the compiler.

[1] https://lore.kernel.org/all/[e-mail]/

Fixes: 8e289f454289 ("selftests/resctrl: Add resctrl.h into build deps")
Cc: Ilpo Järvinen <[e-mail]>
Signed-off-by: John Hubbard <[e-mail]>
Acked-by: Reinette Chatre <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/resctrl/Makefile

···
 
 TEST_GEN_PROGS := resctrl_tests
 
+LOCAL_HDRS += $(wildcard *.h)
+
 include ../lib.mk
 
-$(OUTPUT)/resctrl_tests: $(wildcard *.[ch])
+$(OUTPUT)/resctrl_tests: $(wildcard *.c)