Remove custom pytensor flags or move them to pytensor

[ricardoV94]

If these flags are needed for PyMC they are also needed for PyTensor. Doesn't make sense to have them here.

pymc/pymc/__init__.py

Lines 27 to 46 in 45069a9

	def __set_compiler_flags():
	# Workarounds for PyTensor compiler problems on various platforms
	import pytensor
	current = pytensor.config.gcc__cxxflags
	augmented = f"{current} -Wno-c++11-narrowing"
	# Work around compiler bug in GCC < 8.4 related to structured exception
	# handling registers on Windows.
	# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65782 for details.
	# First disable C++ exception handling altogether since it's not needed
	# for the C extensions that we generate.
	augmented = f"{augmented} -fno-exceptions"
	# Now disable the generation of stack unwinding tables.
	augmented = f"{augmented} -fno-unwind-tables -fno-asynchronous-unwind-tables"
	pytensor.config.gcc__cxxflags = augmented
	__set_compiler_flags()

This somehow lead to problems in the CI of pymc-experimental (band-aid in pymc-devs/pytensor#1009) but that's not super relevant for the question here.