Regenerate Makefile.in for zstd dependency

The version of Makefile.in that landed in https://crrev.com/c/4722191
had a Makefile.in that was generated from a previous version of
Makefile.am where the libzstd dependency wasn't optional. That's causing
some problems (see: https://crrev.com/c/5193965) and is a simple
mistake.

I generated this CL by simply running `automake`, so it simply makes the
checked in generated Makefile.in based on the checked in source
Makefile.am

Change-Id: Iabb4a99bfac3f5ef6067a140bd373c9fb894878a
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/5200626
Reviewed-by: Mike Frysinger <vapier@chromium.org>

Makefile.in

@@ -2691,11 +2691,13 @@ src_tools_linux_dump_syms_dump_syms_SOURCES = \
 	src/tools/linux/dump_syms/dump_syms.cc
 
 src_tools_linux_dump_syms_dump_syms_CXXFLAGS = \
-	$(RUSTC_DEMANGLE_CFLAGS)
+	$(RUSTC_DEMANGLE_CFLAGS) \
+	$(ZSTD_CFLAGS)
 
 src_tools_linux_dump_syms_dump_syms_LDADD = \
 	$(RUSTC_DEMANGLE_LIBS) \
-	-lz -lzstd
+	$(ZSTD_CFLAGS) \
+	-lz
 
 src_tools_linux_md2core_minidump_2_core_SOURCES = \
 	src/common/linux/memory_mapped_file.cc \
@@ -2822,13 +2824,15 @@ src_common_dumper_unittest_SOURCES = \
 src_common_dumper_unittest_CPPFLAGS = \
 	$(AM_CPPFLAGS) $(TEST_CFLAGS) \
 	$(RUSTC_DEMANGLE_CFLAGS) \
-	$(PTHREAD_CFLAGS)
+	$(PTHREAD_CFLAGS) \
+	$(ZSTD_CFLAGS)
 
 src_common_dumper_unittest_LDADD = \
 	$(TEST_LIBS) \
 	$(RUSTC_DEMANGLE_LIBS) \
 	$(PTHREAD_CFLAGS) $(PTHREAD_LIBS) \
-	-lz -lzstd
+	$(ZSTD_LIBS) \
+	-lz
 
 src_common_mac_macho_reader_unittest_SOURCES = \
 	src/common/dwarf_cfi_to_module.cc \