Move stuff to vendor

vendor/libsndfile/lib/Win64/libsndfile-1.def

@@ -0,0 +1,47 @@
+; Auto-generated by create_symbols_file.py
+
+LIBRARY libsndfile-1.dll
+EXPORTS
+
+sf_command           @1
+sf_open              @2
+sf_close             @3
+sf_seek              @4
+sf_error             @7
+sf_perror            @8
+sf_error_str         @9
+sf_error_number      @10
+sf_format_check      @11
+sf_read_raw          @16
+sf_readf_short       @17
+sf_readf_int         @18
+sf_readf_float       @19
+sf_readf_double      @20
+sf_read_short        @21
+sf_read_int          @22
+sf_read_float        @23
+sf_read_double       @24
+sf_write_raw         @32
+sf_writef_short      @33
+sf_writef_int        @34
+sf_writef_float      @35
+sf_writef_double     @36
+sf_write_short       @37
+sf_write_int         @38
+sf_write_float       @39
+sf_write_double      @40
+sf_strerror          @50
+sf_get_string        @60
+sf_set_string        @61
+sf_version_string    @68
+sf_open_fd           @70
+sf_wchar_open        @71
+sf_open_virtual      @80
+sf_write_sync        @90
+sf_set_chunk         @100
+sf_get_chunk_size    @101
+sf_get_chunk_data    @102
+sf_get_chunk_iterator @103
+sf_next_chunk_iterator @104
+sf_current_byterate  @110
+

vendor/libsndfile/lib/Win64/pkgconfig/sndfile.pc

@@ -0,0 +1,12 @@
+prefix=c:/devel/target/libsndfile
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: sndfile
+Description: A library for reading and writing audio files
+Requires: 
+Version: 1.0.28
+Libs: -L${libdir} -lsndfile
+Libs.private: Ext/libflac.la Ext/libvorbis.la Ext/libogg.la
+Cflags: -I${includedir}