mingw: add the build logic for the previous commit

Separate commits for the zig logic and the copied files.

Author: andrewrk

src/mingw.zig

@@ -33,6 +33,9 @@ pub fn buildCRTFile(comp: *Compilation, crt_file: CRTFile, prog_node: *std.Progr
             try args.appendSlice(&[_][]const u8{
                 "-D_SYSCRT=1",
                 "-DCRTDLL=1",
+                // Prevents warning: 'used' attribute ignored on a non-definition declaration
+                // pointing at extern _CRTALLOC
+                "-Wno-ignored-attributes",
                 // Uncommenting this makes mingw-w64 look for wmain instead of main.
                 //"-DUNICODE",
                 //"-D_UNICODE",
@@ -753,16 +756,46 @@ const mingwex_generic_src = [_][]const u8{
     "stdio" ++ path.sep_str ++ "atoll.c",
     "stdio" ++ path.sep_str ++ "fgetpos64.c",
     "stdio" ++ path.sep_str ++ "fopen64.c",
+    "stdio" ++ path.sep_str ++ "fseeki64.c",
     "stdio" ++ path.sep_str ++ "fseeko32.c",
     "stdio" ++ path.sep_str ++ "fseeko64.c",
-    "stdio" ++ path.sep_str ++ "fseeki64.c",
     "stdio" ++ path.sep_str ++ "fsetpos64.c",
     "stdio" ++ path.sep_str ++ "ftello.c",
     "stdio" ++ path.sep_str ++ "ftello64.c",
     "stdio" ++ path.sep_str ++ "ftruncate64.c",
     "stdio" ++ path.sep_str ++ "lltoa.c",
     "stdio" ++ path.sep_str ++ "lltow.c",
     "stdio" ++ path.sep_str ++ "lseek64.c",
+    "stdio" ++ path.sep_str ++ "mingw_asprintf.c",
+    "stdio" ++ path.sep_str ++ "mingw_dummy__lock.c",
+    "stdio" ++ path.sep_str ++ "mingw_fprintf.c",
+    "stdio" ++ path.sep_str ++ "mingw_fprintfw.c",
+    "stdio" ++ path.sep_str ++ "mingw_fscanf.c",
+    "stdio" ++ path.sep_str ++ "mingw_fwscanf.c",
+    "stdio" ++ path.sep_str ++ "mingw_lock.c",
+    "stdio" ++ path.sep_str ++ "mingw_pformat.c",
+    "stdio" ++ path.sep_str ++ "mingw_pformatw.c",
+    "stdio" ++ path.sep_str ++ "mingw_printf.c",
+    "stdio" ++ path.sep_str ++ "mingw_printfw.c",
+    "stdio" ++ path.sep_str ++ "mingw_scanf.c",
+    "stdio" ++ path.sep_str ++ "mingw_snprintf.c",
+    "stdio" ++ path.sep_str ++ "mingw_snprintfw.c",
+    "stdio" ++ path.sep_str ++ "mingw_sprintf.c",
+    "stdio" ++ path.sep_str ++ "mingw_sprintfw.c",
+    "stdio" ++ path.sep_str ++ "mingw_sscanf.c",
+    "stdio" ++ path.sep_str ++ "mingw_swscanf.c",
+    "stdio" ++ path.sep_str ++ "mingw_vasprintf.c",
+    "stdio" ++ path.sep_str ++ "mingw_vfprintf.c",
+    "stdio" ++ path.sep_str ++ "mingw_vfprintfw.c",
+    "stdio" ++ path.sep_str ++ "mingw_vfscanf.c",
+    "stdio" ++ path.sep_str ++ "mingw_vprintf.c",
+    "stdio" ++ path.sep_str ++ "mingw_vprintfw.c",
+    "stdio" ++ path.sep_str ++ "mingw_vsnprintf.c",
+    "stdio" ++ path.sep_str ++ "mingw_vsnprintfw.c",
+    "stdio" ++ path.sep_str ++ "mingw_vsprintf.c",
+    "stdio" ++ path.sep_str ++ "mingw_vsprintfw.c",
+    "stdio" ++ path.sep_str ++ "mingw_wscanf.c",
+    "stdio" ++ path.sep_str ++ "mingw_wvfscanf.c",
     "stdio" ++ path.sep_str ++ "scanf.S",
     "stdio" ++ path.sep_str ++ "snprintf.c",
     "stdio" ++ path.sep_str ++ "snwprintf.c",