stack.yaml: Remove spurious flags #1658

Job	Run time
Build ARM binary (self-hosted, Linux, ARM64, maerwald, armv7-linux-ghcup, 9.2.8, ARM)	32m 22s
Build ARM binary (self-hosted, Linux, ARM64, maerwald, aarch64-linux-ghcup, 9.4.8, ARM64)	12m 12s
Build binary (FreeBSD)	5m 47s
Build linux binary (ubuntu-latest, i386-linux-ghcup, 8.10.7, 32)	17m 11s
Build binary (Mac/Win) (self-hosted, macOS, ARM64, aarch64-apple-darwin-ghcup, 9.4.8, ARM64)	10m 56s
Build linux binary (ubuntu-latest, x86_64-linux-ghcup, 9.4.8, 64)	13m 56s
Build binary (Mac/Win) (macOS-12, x86_64-apple-darwin-ghcup, 9.4.8, 64)	28m 55s
Build binary (Mac/Win) (windows-latest, x86_64-mingw64-ghcup, 9.4.8, 64)	19m 55s
Test FreeBSD	1m 33s
Test linux (ubuntu-latest, i386-linux-ghcup, 8.10.7, 32, Alpine)	2m 41s
hls	28m 21s
Test linux (ubuntu-latest, x86_64-linux-ghcup, 9.4.8, 64, Alpine)	2m 27s
Test linux (ubuntu-latest, x86_64-linux-ghcup, 9.4.8, 64, Ubuntu)	6m 33s
Test Mac/Win (self-hosted, macOS, ARM64, aarch64-apple-darwin-ghcup, 9.4.8, ARM64, na)	4m 37s
Test Mac/Win (macOS-12, x86_64-apple-darwin-ghcup, 9.4.8, 64, na)	12m 30s
Test Mac/Win (windows-latest, x86_64-mingw64-ghcup, 9.4.8, 64, na)	21m 9s
Test ARM (self-hosted, Linux, ARM64, maerwald, armv7-linux-ghcup, 9.2.8, ARM, Ubuntu)	4m 8s
Test ARM (self-hosted, Linux, ARM64, maerwald, aarch64-linux-ghcup, 9.4.8, ARM64, Ubuntu)	5m 8s
release	0s
	3h 50m 21s

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