libpqxx: remove unneeded patch

Signed-off-by: Igor Bezzubchenko <garikello@gmail.com>

libs/libpqxx/patches/100-install-test-executor.patch

@@ -1,10 +0,0 @@
---- a/test/CMakeLists.txt
-+++ b/test/CMakeLists.txt
-@@ -14,3 +14,7 @@ add_test(
-     WORKING_DIRECTORY ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}
-     COMMAND runner
- )
-+
-+if(INSTALL_TEST)
-+	install(PROGRAMS runner TYPE BIN RENAME libpqxx-test-runner)
-+endif()