build.zig: fix header search paths

These are not handled properly when used as a dependency unless they
are attached to all of the artifacts because if a user only depends on
libssl, it doesn't include the headers attached to libcrypto.

build.zig

@@ -37,6 +37,35 @@ const LibreSslLibs = struct {
         b.installArtifact(self.libssl);
         b.installArtifact(self.libtls);
     }
+
+    pub fn header_search(
+        self: LibreSslLibs,
+        b: *std.Build,
+        base: []const u8,
+        skiplist: []const SkipSpec,
+    ) !void {
+        const dir = try b.build_root.handle.openIterableDir(base, .{});
+        var walker = try dir.walk(b.allocator);
+        defer walker.deinit();
+
+        walker: while (try walker.next()) |child| {
+            for (skiplist) |entry| {
+                switch (entry) {
+                    .starts_with => |name| if (std.mem.startsWith(u8, child.path, name)) continue :walker,
+                    .ends_with => |name| if (std.mem.startsWith(u8, child.path, name)) continue :walker,
+                }
+            }
+
+            if (std.mem.endsWith(u8, child.basename, ".h")) {
+                const full = try std.mem.concat(b.allocator, u8, &.{ base, child.path });
+                defer b.allocator.free(full);
+
+                self.libcrypto.installHeader(full, child.path);
+                self.libssl.installHeader(full, child.path);
+                self.libtls.installHeader(full, child.path);
+            }
+        }
+    }
 };
 
 // TODO: this doesn't get cached, so it runs on every single build, which kind of sucks.
@@ -208,9 +237,8 @@ pub fn libresslBuild(
     const include_dir = try b.build_root.handle.openDir(install_header_prefix ++ "openssl", .{});
     try b.build_root.handle.copyFile(header, include_dir, "opensslconf.h", .{});
 
-    try header_search(
+    try libressl_libs.header_search(
         b,
-        libressl_libs.libcrypto,
         install_header_prefix,
         &.{
             .{ .starts_with = "compat" },
@@ -306,33 +334,6 @@ const SkipSpec = union(enum) {
     ends_with: []const u8,
 };
 
-pub fn header_search(
-    b: *std.Build,
-    lib: *std.Build.Step.Compile,
-    base: []const u8,
-    skiplist: []const SkipSpec,
-) !void {
-    const dir = try b.build_root.handle.openIterableDir(base, .{});
-    var walker = try dir.walk(b.allocator);
-    defer walker.deinit();
-
-    walker: while (try walker.next()) |child| {
-        for (skiplist) |entry| {
-            switch (entry) {
-                .starts_with => |name| if (std.mem.startsWith(u8, child.path, name)) continue :walker,
-                .ends_with => |name| if (std.mem.startsWith(u8, child.path, name)) continue :walker,
-            }
-        }
-
-        if (std.mem.endsWith(u8, child.basename, ".h")) {
-            const full = try std.mem.concat(b.allocator, u8, &.{ base, child.path });
-            defer b.allocator.free(full);
-
-            lib.installHeader(full, child.path);
-        }
-    }
-}
-
 const base_src_prefix = "./";
 const libcrypto_src_prefix = base_src_prefix ++ "crypto/";
 const install_header_prefix = base_src_prefix ++ "include/";