sphinx: new libstemmer release

Fixes Homebrew/legacy-homebrew#32058.

Formula/sphinx.rb

@@ -29,7 +29,7 @@ class Sphinx < Formula
   # http://snowball.tartarus.org/
   resource 'stemmer' do
     url 'http://snowball.tartarus.org/dist/libstemmer_c.tgz'
-    sha1 'bbe1ba5bbebb146575a575b8ca3342aa3b91bf93'
+    sha1 '9b0f120a68a3c688b2f5a8d0f681620465c29d38'
   end
 
   fails_with :llvm do
@@ -45,6 +45,11 @@ class Sphinx < Formula
   def install
     (buildpath/'libstemmer_c').install resource('stemmer')
 
+    # libstemmer changed the name of the non-UTF8 Hungarian source files,
+    # but the released version of sphinx still refers to it under the old name.
+    inreplace "libstemmer_c/Makefile.in",
+      "stem_ISO_8859_1_hungarian", "stem_ISO_8859_2_hungarian"
+
     args = %W[--prefix=#{prefix}
               --disable-dependency-tracking
               --localstatedir=#{var}