Remove the patch applied to pass the test/fiddle/test_import.rb on PPC.

In Ruby 3.0.3, a new logic with the hard-coded "libc.so.6" to detect glibc
works on PPC, both Power 8 and 9.
See <https://bugs.ruby-lang.org/issues/12666#note-13>.

Note the logic also fixes the following error on a Power 9 environment where
the path is `/lib64/glibc-hwcaps/power9/libc-2.28.so`.

```
/builddir/build/BUILD/ruby-2.6.9/.ext/common/fiddle/import.rb:299:in `import_function': cannot find the function: strcpy() (Fiddle::DLError)
    from /builddir/build/BUILD/ruby-2.6.9/.ext/common/fiddle/import.rb:172:in `extern'
    from /builddir/build/BUILD/ruby-2.6.9/test/fiddle/test_import.rb:17:in `<module:LIBC>'
    from /builddir/build/BUILD/ruby-2.6.9/test/fiddle/test_import.rb:10:in `<module:Fiddle>'
    from /builddir/build/BUILD/ruby-2.6.9/test/fiddle/test_import.rb:9:in `<top (required)>'
    from /builddir/build/BUILD/ruby-2.6.9/test/lib/test/unit.rb:958:in `require'
    from /builddir/build/BUILD/ruby-2.6.9/test/lib/test/unit.rb:958:in `block in non_options'
    from /builddir/build/BUILD/ruby-2.6.9/test/lib/test/unit.rb:952:in `each'
    from /builddir/build/BUILD/ruby-2.6.9/test/lib/test/unit.rb:952:in `non_options'
    from /builddir/build/BUILD/ruby-2.6.9/test/lib/test/unit.rb:64:in `process_args'
    from /builddir/build/BUILD/ruby-2.6.9/test/lib/test/unit.rb:130:in `process_args'
    from /builddir/build/BUILD/ruby-2.6.9/test/lib/test/unit.rb:1136:in `process_args'
    from /builddir/build/BUILD/ruby-2.6.9/test/lib/test/unit.rb:1141:in `run'
    from /builddir/build/BUILD/ruby-2.6.9/test/lib/test/unit.rb:1148:in `run'
    from ./test/runner.rb:33:in `<main>'
```

ruby-2.3.1-Rely-on-ldd-to-detect-glibc.patch

@@ -1,30 +0,0 @@
-From 346e147ba6480839b87046e9a9efab0bf6ed3660 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?V=C3=ADt=20Ondruch?= <vondruch@redhat.com>
-Date: Wed, 10 Aug 2016 17:35:48 +0200
-Subject: [PATCH] Rely on ldd to detect glibc.
-
-This is just workaround, since we know we are quite sure this will be successful
-on Red Hat platforms.
-
-This workaround rhbz#1361037
----
- test/fiddle/helper.rb | 3 +++
- 1 file changed, 3 insertions(+)
-
-diff --git a/test/fiddle/helper.rb b/test/fiddle/helper.rb
-index 1da3d93..65148a1 100644
---- a/test/fiddle/helper.rb
-+++ b/test/fiddle/helper.rb
-@@ -139,6 +139,9 @@
-   libc_so = libm_so = "/usr/lib/libSystem.B.dylib"
- end
- 
-+# Just ignore the heuristic, because it is not reliable on all platforms.
-+libc_so = libm_so = nil
-+
- if !libc_so || !libm_so
-   ruby = EnvUtil.rubybin
-   # When the ruby binary is 32-bit and the host is 64-bit,
--- 
-2.9.2
-

ruby.spec

@@ -22,7 +22,7 @@
 %endif
 
 
-%global release 156
+%global release 157
 %{!?release_string:%define release_string %{?development_release:0.}%{release}%{?development_release:.%{development_release}}%{?dist}}
 
 # The RubyGems library has to stay out of Ruby directory tree, since the
@@ -138,10 +138,6 @@ Patch5: ruby-1.9.3-mkmf-verbose.patch
 # https://lists.fedoraproject.org/archives/list/ruby-sig@lists.fedoraproject.org/message/LH6L6YJOYQT4Y5ZNOO4SLIPTUWZ5V45Q/
 # For now, load the ABRT hook via this simple patch:
 Patch6: ruby-2.7.0-Initialize-ABRT-hook.patch
-# Workaround "an invalid stdio handle" error on PPC, due to recently introduced
-# hardening features of glibc (rhbz#1361037).
-# https://bugs.ruby-lang.org/issues/12666
-Patch9: ruby-2.3.1-Rely-on-ldd-to-detect-glibc.patch
 # Fix DWARF5 support.
 # https://bugzilla.redhat.com/show_bug.cgi?id=1920533
 # https://bugs.ruby-lang.org/issues/17585
@@ -674,7 +670,6 @@ rm -rf ext/fiddle/libffi*
 %patch4 -p1
 %patch5 -p1
 %patch6 -p1
-%patch9 -p1
 %patch15 -p1
 %patch16 -p1
 %patch17 -p1
@@ -1461,6 +1456,9 @@ DISABLE_TESTS="$DISABLE_TESTS -n !/OpenSSL::TestCipher#test_ciphers/"
 
 
 %changelog
+* Tue Jan 11 2022 Jun Aruga <jaruga@redhat.com> - 3.0.3-157
+- Remove the patch applied to pass the test/fiddle/test_import.rb on PPC.
+
 * Mon Jan 10 2022 Miro Hrončok <mhroncok@redhat.com> - 3.0.3-156
 - Rebuilt for https://fedoraproject.org/wiki/Changes/LIBFFI34