pkg/fontconfig: move defines to fix x86_64-windows targets

Some targets were duplicated in the all-targets definition list that
will not build for a Windows target. They're all moved to the
non-Windows configuration. The target now builds against a mingw64
prefix with the appropriate dependencies installed.

Updates #437

pkg/fontconfig/build.zig

@@ -40,29 +40,13 @@ pub fn build(b: *std.Build) !void {
         "-DHAVE_STDLIB_H",
         "-DHAVE_STRING_H",
         "-DHAVE_UNISTD_H",
-        "-DHAVE_SYS_STATVFS_H",
         "-DHAVE_SYS_PARAM_H",
-        "-DHAVE_SYS_MOUNT_H",
 
-        "-DHAVE_LINK",
         "-DHAVE_MKSTEMP",
-        "-DHAVE_MKOSTEMP",
-        "-DHAVE__MKTEMP_S",
-        "-DHAVE_MKDTEMP",
-        "-DHAVE_GETOPT",
-        "-DHAVE_GETOPT_LONG",
         //"-DHAVE_GETPROGNAME",
         //"-DHAVE_GETEXECNAME",
         "-DHAVE_RAND",
-        "-DHAVE_RANDOM",
-        "-DHAVE_LRAND48",
         //"-DHAVE_RANDOM_R",
-        "-DHAVE_RAND_R",
-        "-DHAVE_READLINK",
-        "-DHAVE_FSTATVFS",
-        "-DHAVE_FSTATFS",
-        "-DHAVE_LSTAT",
-        "-DHAVE_MMAP",
         "-DHAVE_VPRINTF",
 
         "-DHAVE_FT_GET_BDF_PROPERTY",
@@ -116,17 +100,23 @@ pub fn build(b: *std.Build) !void {
         });
     } else {
         try flags.appendSlice(&.{
-            "-DHAVE_SYS_STATVFS_H",
-            "-DHAVE_SYS_MOUNT_H",
+            "-DHAVE_FSTATFS",
+            "-DHAVE_FSTATVFS",
+            "-DHAVE_GETOPT",
+            "-DHAVE_GETOPT_LONG",
             "-DHAVE_LINK",
-            "-DHAVE_MKOSTEMP",
-            "-DHAVE_RANDOM",
             "-DHAVE_LRAND48",
-            "-DHAVE_RAND_R",
-            "-DHAVE_READLINK",
             "-DHAVE_LSTAT",
+            "-DHAVE_MKDTEMP",
+            "-DHAVE_MKOSTEMP",
+            "-DHAVE__MKTEMP_S",
             "-DHAVE_MMAP",
             "-DHAVE_PTHREAD",
+            "-DHAVE_RANDOM",
+            "-DHAVE_RAND_R",
+            "-DHAVE_READLINK",
+            "-DHAVE_SYS_MOUNT_H",
+            "-DHAVE_SYS_STATVFS_H",
 
             "-DFC_CACHEDIR=\"/var/cache/fontconfig\"",
             "-DFC_TEMPLATEDIR=\"/usr/share/fontconfig/conf.avail\"",