ofxOscReceiver: remove #ifdef and adjust stress test #149

Job	Run time
build-emscripten (emscripten)	3m 6s
build-msys2 (mingw64)	4m 26s
build-vs2022 (x64)	7m 20s
build-vs2022 (ARM64)	7m 55s
build-ios-tvos (ios, ios)	2m 11s
build-linux64-platforms (linux64, 64gcc6)	1m 59s
build-vs2022 (ARM64EC)	8m 59s
build-macos (osx, xcode)	1m 18s
build-macos (osx, makefiles)	2m 14s
rpi-build (armv6l, armhf, arm-linux-gnueabihf, 1)	1m 46s
rpi-build (aarch64, arm64, aarch64-linux-gnu, 1)	1m 43s
	42m 57s

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