Fixes sigtimedwait flag, makes zig version in build zon compatible with anyzig

Author: MasonRemaley

build.zig.zon

@@ -2,7 +2,7 @@
     .name = .sdl,
     .fingerprint = 0xec638ccbd103848b,
     .version = "0.0.0",
-    .minimum_zig_version = "0.15.0-dev.1218+bc8e1a74c",
+    .minimum_zig_version = "0.15.0",
     .dependencies = .{
         .sdl = .{
             .url = "https://github.com/libsdl-org/SDL/archive/refs/tags/release-3.2.22.tar.gz",

src/linux.zig

@@ -482,6 +482,7 @@ pub fn build(
     // Set the platform specific build config
     const libdecor_version_string = build_zon.dependencies.decor.version;
     const libdecor_version = comptime std.SemanticVersion.parse(libdecor_version_string) catch unreachable;
+    const have_sigtimedwait: i64 = if (target.os.tag == .openbsd) 0 else 1;
     build_config_h.addValues(.{
         .HAVE_GCC_ATOMICS = 1,
 
@@ -604,6 +605,7 @@ pub fn build(
         .HAVE_POSIX_FALLOCATE = 1,
         .HAVE_SIGACTION = 1,
         .HAVE_SA_SIGACTION = 1,
+        .HAVE_SIGTIMEDWAIT = have_sigtimedwait,
         .HAVE_ST_MTIM = 1,
         .HAVE_SETJMP = 1,
         .HAVE_NANOSLEEP = 1,