dev-libs/unittest++: drop patch I ended up not using

.. because it needs another. I went for a workaround instead.

Signed-off-by: Sam James <sam@gentoo.org>

dev-libs/unittest++/files/unittest++-2.0.0-fix-pc-version.patch

@@ -1,37 +0,0 @@
-https://bugs.gentoo.org/863974
-https://github.com/unittest-cpp/unittest-cpp/pull/188
-https://github.com/msys2/MINGW-packages/issues/17297
-
-From 91790b98e03654c72b0783cf8fbc66c5f56892f5 Mon Sep 17 00:00:00 2001
-From: Sergei Trofimovich <slyich@gmail.com>
-Date: Mon, 18 Dec 2023 19:05:55 +0000
-Subject: [PATCH] CMakeLists.txt: fix PACKAGE_VERSION substitution in .pc file
-
-Before the change project built using `cmake` had Version field empty:
-
-    Version:
-
-After the change version is set as expected:
-
-    Version: 2.1.0
-
-Noticed as as a build failure of `echant-2.6.4` which failed to find the
-package using `pkg-config --exists --print-errors "UnitTest++ >= 1.6"`
-expression.
----
- CMakeLists.txt | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index b4c75c9..10ecf60 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -135,6 +135,7 @@ set(prefix      ${CMAKE_INSTALL_PREFIX})
- set(exec_prefix ${CMAKE_INSTALL_PREFIX}/bin)
- set(libdir      ${CMAKE_INSTALL_PREFIX}/lib${LIB_SUFFIX})
- set(includedir  ${CMAKE_INSTALL_PREFIX}/include/UnitTest++)
-+set(PACKAGE_VERSION ${CMAKE_PROJECT_VERSION})
- configure_file("UnitTest++.pc.in" "UnitTest++.pc" @ONLY)
- if(${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
-     set(pkgconfdir  ${CMAKE_INSTALL_PREFIX}/libdata/pkgconfig)
-