Remove PPC_FMT_FLAGS setting from libenvpp.cmake #3679

Job	Run time
cpp-lint / clang-format	15s
ubuntu / clang-build (ubuntu-24.04-arm)	1m 32s
ubuntu / gcc-build (ubuntu-24.04, Release)	1m 48s
ubuntu / clang-build (ubuntu-24.04)	2m 43s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	2m 39s
ubuntu / gcc-build (ubuntu-24.04, Debug)	1m 34s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	1m 31s
mac / clang-build (Debug)	2m 16s
mac / clang-build (Release)	1m 47s
windows / msvc-build (Release)	1m 45s
windows / clang-build	2m 9s
windows / msvc-build (Debug)	2m 51s
mac / clang-test	4m 55s
windows / clang-test	-1s
windows / clang-test-extended	-1s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	1m 39s
ubuntu / clang-test (ubuntu-24.04)	4m 44s
ubuntu / clang-test (ubuntu-24.04-arm)	8m 0s
ubuntu / gcc-test (ubuntu-24.04)	1s
ubuntu / gcc-test (ubuntu-24.04-arm)	7m 29s
windows / msvc-test	4m 17s
mac / clang-test-extended	3m 2s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	1s
ubuntu / clang-sanitizer-test-extended	1s
windows / msvc-test-extended	1s
ubuntu / clang-test-extended	1s
ubuntu / gcc-test-extended	1s
ubuntu / gcc-build-codecov	1s
perf	0s
pages	0s
	57m 1s

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