Fix build fail on macOS 26 for Ruby 3.0

ruby-3.0-macos26.patch

--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -62,7 +62,11 @@ static ID id_eq;
 static ID id_half;
 
 /* MACRO's to guard objects from GC by keeping them in stack */
+#ifdef RBIMPL_ATTR_MAYBE_UNUSED
+#define ENTER(n) RBIMPL_ATTR_MAYBE_UNUSED() volatile VALUE vStack[n];int iStack=0
+#else
 #define ENTER(n) volatile VALUE RB_UNUSED_VAR(vStack[n]);int iStack=0
+#endif
 #define PUSH(x)  (vStack[iStack++] = (VALUE)(x))
 #define SAVE(p)  PUSH((p)->obj)
 #define GUARD_OBJ(p,y) ((p)=(y), SAVE(p))
--- a/ext/socket/extconf.rb
+++ b/ext/socket/extconf.rb
@@ -657,7 +657,12 @@
 SRC
     print "fixing apple's netinet6/in6.h ..."; $stdout.flush
-    in6 = File.read("/usr/include/#{hdr}")
+    in6_path = "/usr/include/#{hdr}"
+    if !File.exist?(in6_path)
+      sdk = `xcrun --show-sdk-path 2>/dev/null`.strip
+      in6_path = File.join(sdk, "usr/include", hdr) if !sdk.empty?
+    end
+    in6 = File.read(in6_path)
     if in6.gsub!(/\*\(const\s+__uint32_t\s+\*\)\(const\s+void\s+\*\)\(&(\(\w+\))->s6_addr\[(\d+)\]\)/) do
         i, r = $2.to_i.divmod(4)
         if r.zero?

ruby-3.1-macos26.patch

--- a/ext/socket/extconf.rb
+++ b/ext/socket/extconf.rb
@@ -660,7 +660,12 @@
 SRC
     print "fixing apple's netinet6/in6.h ..."; $stdout.flush
-    in6 = File.read("/usr/include/#{hdr}")
+    in6_path = "/usr/include/#{hdr}"
+    if !File.exist?(in6_path)
+      sdk = `xcrun --show-sdk-path 2>/dev/null`.strip
+      in6_path = File.join(sdk, "usr/include", hdr) if !sdk.empty?
+    end
+    in6 = File.read(in6_path)
     if in6.gsub!(/\*\(const\s+__uint32_t\s+\*\)\(const\s+void\s+\*\)\(&(\(\w+\))->s6_addr\[(\d+)\]\)/) do
         i, r = $2.to_i.divmod(4)
         if r.zero?