perf: build: Link lib 'zstd' for static build

When build static perf, Makefile reports the error:

Makefile.config:480: No libdw DWARF unwind found, Please install
elfutils-devel/libdw-dev >= 0.158 and/or set LIBDW_DIR

The libdw has been installed on the system, but the build system fails
to build the feature detecting binary 'test-libdw-dwarf-unwind'. The
failure is caused by missing to link the lib 'zstd'.

Link lib 'zstd' for the static build, in the end, the dwarf feature can
be enabled in the static perf.

Signed-off-by: Leo Yan <[e-mail]>
Tested-by: Ian Rogers <[e-mail]>
Cc: [e-mail]
Cc: James Clark <[e-mail]>
Cc: Thomas Richter <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Namhyung Kim <[e-mail]>

tools/build/feature/Makefile

···
 
 DWARFLIBS := -ldw
 ifeq ($(findstring -static,${LDFLAGS}),-static)
-  DWARFLIBS += -lelf -lz -llzma -lbz2
+  DWARFLIBS += -lelf -lz -llzma -lbz2 -lzstd
 
   LIBDW_VERSION := $(shell $(PKG_CONFIG) --modversion libdw)
   LIBDW_VERSION_1 := $(word 1, $(subst ., ,$(LIBDW_VERSION)))

tools/perf/Makefile.config

···
 endif
 DWARFLIBS := -ldw
 ifeq ($(findstring -static,${LDFLAGS}),-static)
-  DWARFLIBS += -lelf -ldl -lz -llzma -lbz2
+  DWARFLIBS += -lelf -ldl -lz -llzma -lbz2 -lzstd
 
   LIBDW_VERSION := $(shell $(PKG_CONFIG) --modversion libdw)
   LIBDW_VERSION_1 := $(word 1, $(subst ., ,$(LIBDW_VERSION)))