Breakpad: Add forgotten project file for the crash handler

src/tools/qtcrashhandler/qtcrashhandler.pro

+TARGET = qtcrashhandler
+
+TEMPLATE = app
+QT_BREAKPAD_ROOT_PATH = $$(QT_BREAKPAD_ROOT_PATH)
+include($${QT_BREAKPAD_ROOT_PATH}/qtcrashhandler.pri)
+
+include(../../../qtcreator.pri)
+include(../../private_headers.pri)
+DESTDIR = $$IDE_BIN_PATH
+include(../../rpath.pri)
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