Revert "[lldb] Fix ^C handling in IOHandlerProcessSTDIO"

This reverts commit f93d861349 -- looks
like a bad application of `patch -p<level>`

lldb/lldb/test/API/iohandler/sigint/Makefile

@@ -1 +0,0 @@
-include Makefile.rules

lldb/lldb/test/API/iohandler/sigint/TestProcessIOHandlerInterrupt.py

@@ -1,42 +0,0 @@
-"""
-Test sending SIGINT Process IOHandler
-"""
-
-import os
-
-import lldb
-from lldbsuite.test.decorators import *
-from lldbsuite.test.lldbtest import *
-from lldbsuite.test.lldbpexpect import PExpectTest
-
-class TestCase(PExpectTest):
-
-    mydir = TestBase.compute_mydir(__file__)
-
-    def test(self):
-        self.build(dictionary={"CXX_SOURCES":"cat.cpp"})
-        self.launch(executable=self.getBuildArtifact(), timeout=5)
-
-        self.child.sendline("process launch")
-        self.child.expect("Process .* launched")
-
-        self.child.sendline("Hello cat")
-        self.child.expect_exact("read: Hello cat")
-
-        self.child.sendintr()
-        self.child.expect("Process .* stopped")
-        self.expect_prompt()
-
-        self.expect("bt", substrs=["input_copy_loop"])
-
-        self.child.sendline("continue")
-        self.child.expect("Process .* resuming")
-
-        self.child.sendline("Goodbye cat")
-        self.child.expect_exact("read: Goodbye cat")
-
-        self.child.sendeof()
-        self.child.expect("Process .* exited")
-        self.expect_prompt()
-
-        self.quit()

lldb/lldb/test/API/iohandler/sigint/cat.cpp

@@ -1,12 +0,0 @@
-#include <iostream>
-
-void input_copy_loop() {
-  std::string str;
-  while (std::getline(std::cin, str))
-    std::cout << "read: " << str << std::endl;
-}
-
-int main() {
-  input_copy_loop();
-  return 0;
-}