Getting json compile warnings in when compiling with mingw64

[robe2]

I don't recall getting these warnings last time I compiled www_fdw, but I might have. The dlls compile and load and seem to work, so not sure if I should worry about these or not. This is compiling against PostgreSQL 9.4, though I doubt that matters.

static void www_explain_foreign_scan(ForeignScanState *node, ExplainState *es);
             ^
gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -g  -I/p
clude/libxml2 -I/usr/include/libxml2 -I. -I./ -Ic:/MING32~2/projects/POSTGR~1/rel/PG9~1.4W3/include/server -Ic:/MING32~2/projects/POSTGR~1/rel/PG9~1.4W3/include/internal -I.  -I/projects/curl/rel-curl-7.39.
2/projects/POSTGR~1/rel/PG9~1.4W3/lib/pgxs/src/MAKEFI~1/../../src/include/port/win32" -Ic:/MING32~2/projects/POSTGR~1/rel/PG9~1.4W3/include/server/port/win32  -c -o libjson-0.8/json.o libjson-0.8/json.c
libjson-0.8/json.c:459:5: warning: no previous prototype for 'act_uc' [-Wmissing-prototypes]
 int act_uc(json_parser *parser)
     ^
libjson-0.8/json.c:467:5: warning: no previous prototype for 'act_yb' [-Wmissing-prototypes]
 int act_yb(json_parser *parser)
     ^
libjson-0.8/json.c:475:5: warning: no previous prototype for 'act_cb' [-Wmissing-prototypes]
 int act_cb(json_parser *parser)
     ^
libjson-0.8/json.c:483:5: warning: no previous prototype for 'act_ce' [-Wmissing-prototypes]
 int act_ce(json_parser *parser)
     ^
libjson-0.8/json.c:489:5: warning: no previous prototype for 'act_ob' [-Wmissing-prototypes]
 int act_ob(json_parser *parser)
     ^
libjson-0.8/json.c:498:5: warning: no previous prototype for 'act_oe' [-Wmissing-prototypes]
 int act_oe(json_parser *parser)
     ^
libjson-0.8/json.c:507:5: warning: no previous prototype for 'act_ab' [-Wmissing-prototypes]
 int act_ab(json_parser *parser)
     ^
libjson-0.8/json.c:514:5: warning: no previous prototype for 'act_ae' [-Wmissing-prototypes]
 int act_ae(json_parser *parser)
     ^
libjson-0.8/json.c:522:5: warning: no previous prototype for 'act_se' [-Wmissing-prototypes]
 int act_se(json_parser *parser)
     ^
libjson-0.8/json.c:532:5: warning: no previous prototype for 'act_sp' [-Wmissing-prototypes]
 int act_sp(json_parser *parser)
     ^
libjson-0.8/json.c:764:5: warning: no previous prototype for 'json_print_mode' [-Wmissing-prototypes]
 int json_print_mode(json_printer *printer, int type, const char *data, uint32_t length, int pretty)
     ^
gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -g   -sh
son-0.8/json.o -Lc:/MING32~2/projects/POSTGR~1/rel/PG9~1.4W3/lib -Wl,--allow-multiple-definition  -Wl,--as-needed   -L/projects/curl/rel-curl-7.39.0w32gcc481/lib -L/projects/libxml/rel-libxml2-2.7.8w32gcc48