CMake: Add benchmarks

Put each benchmark application in a sub-directory instead of specifying all in one
file, because cotire cannot create PCH targets for the same file twice (bench.cpp).

build/cmake/benchmarks/bench/CMakeLists.txt

@@ -0,0 +1,34 @@
+#############################################################################
+# Name:        build/cmake/benchmarks/bench/CMakeLists.txt
+# Purpose:     CMake file for benchmarks
+# Author:      Maarten Bent
+# Created:     2021-02-07
+# Copyright:   (c) 2021 wxWidgets development team
+# Licence:     wxWindows licence
+#############################################################################
+
+set(BENCH_SRC
+    bench.cpp
+    bench.h
+    datetime.cpp
+    htmlparser/htmlpars.cpp
+    htmlparser/htmlpars.h
+    htmlparser/htmltag.cpp
+    htmlparser/htmltag.h
+    ipcclient.cpp
+    log.cpp
+    mbconv.cpp
+    printfbench.cpp
+    strings.cpp
+    tls.cpp
+    )
+
+set(BENCH_DATA
+    htmltest.html
+    )
+
+wx_add_benchmark(bench CONSOLE ${BENCH_SRC} DATA ${BENCH_DATA})
+
+if(wxUSE_SOCKETS)
+    wx_exe_link_libraries(bench wxnet)
+endif()