maybe fix flags for vendored

src/Makevars.win

@@ -2,13 +2,13 @@
 # Configure Abseil. If it wasn't available via pkg-config, it was built
 # by cmake in configure.win.
 
-ABSL_LIBS = -labsl_flags_internal -labsl_flags_marshalling -labsl_flags_reflection -labsl_flags_private_handle_accessor -labsl_flags_commandlineflag -labsl_flags_commandlineflag_internal -labsl_flags_config -labsl_flags_program_name -labsl_raw_hash_set -labsl_hashtablez_sampler -labsl_log_internal_check_op -labsl_log_internal_conditions -labsl_log_internal_message -labsl_examine_stack -labsl_log_internal_format -labsl_log_internal_proto -labsl_log_internal_nullguard -labsl_log_internal_log_sink_set -labsl_log_internal_globals -labsl_log_globals -labsl_hash -labsl_city -labsl_bad_variant_access -labsl_low_level_hash -labsl_vlog_config_internal -labsl_log_internal_fnmatch -labsl_log_sink -labsl_log_entry -labsl_status -labsl_cord -labsl_cordz_info -labsl_cord_internal -labsl_cordz_functions -labsl_exponential_biased -labsl_cordz_handle -labsl_synchronization -labsl_graphcycles_internal -labsl_kernel_timeout_internal -labsl_time -labsl_civil_time -labsl_time_zone -labsl_crc_cord_state -labsl_crc32c -labsl_crc_internal -labsl_crc_cpu_detect -labsl_bad_optional_access -labsl_stacktrace -labsl_strerror -labsl_str_format_internal -labsl_symbolize -ldbghelp -labsl_debugging_internal -labsl_demangle_internal -labsl_malloc_internal -labsl_strings -labsl_strings_internal -labsl_string_view -labsl_base -ladvapi32 -labsl_spinlock_wait -labsl_int128 -labsl_throw_delegate -labsl_raw_logging_internal -labsl_log_severity
+ABSL_LIBS = -labsl_flags_internal -labsl_flags_marshalling -labsl_flags_reflection -labsl_flags_private_handle_accessor -labsl_flags_commandlineflag -labsl_flags_commandlineflag_internal -labsl_flags_config -labsl_flags_program_name -labsl_raw_hash_set -labsl_hashtablez_sampler -labsl_log_internal_check_op -labsl_log_internal_conditions -labsl_log_internal_message -labsl_examine_stack -labsl_log_internal_format -labsl_log_internal_proto -labsl_log_internal_nullguard -labsl_log_internal_log_sink_set -labsl_log_internal_globals -labsl_log_globals -labsl_hash -labsl_city -labsl_bad_variant_access -labsl_low_level_hash -labsl_log_sink -labsl_log_entry -labsl_status -labsl_cord -labsl_cordz_info -labsl_cord_internal -labsl_cordz_functions -labsl_exponential_biased -labsl_cordz_handle -labsl_synchronization -labsl_graphcycles_internal -labsl_kernel_timeout_internal -labsl_time -labsl_civil_time -labsl_time_zone -labsl_crc_cord_state -labsl_crc32c -labsl_crc_internal -labsl_crc_cpu_detect -labsl_bad_optional_access -labsl_stacktrace -labsl_strerror -labsl_str_format_internal -labsl_symbolize -ldbghelp -labsl_debugging_internal -labsl_demangle_internal -labsl_malloc_internal -labsl_strings -labsl_strings_internal -labsl_string_view -labsl_base -ladvapi32 -labsl_spinlock_wait -labsl_int128 -labsl_throw_delegate -labsl_raw_logging_internal -labsl_log_severity
 
-ifeq (,$(shell pkg-config absl_base --libs 2>/dev/null))
+ifeq (,$(shell pkgconf absl_base --libs 2>/dev/null))
   ABSL_CFLAGS = -I../tools/dist/include
   ABSL_LIB_FLAGS = -L../tools/dist/lib $(ABSL_LIBS) -limagehlp
 else
-  ABSL_LIB_FLAGS = $(ABSL_LIBS)
+  ABSL_LIB_FLAGS = $(shell pkgconf absl_base --libs)
 endif