misc: Remove include-fixed include path #3243

Job	Run time
Compile sysdeps (dripos)	58s
Build mlibc (x86_64, mlibc)	9m 53s
Compile sysdeps (lemon)	57s
Build mlibc (x86_64, mlibc-static)	1m 54s
Compile sysdeps (aero)	59s
Build mlibc (x86_64, mlibc-shared)	1m 59s
Compile sysdeps (ironclad)	1m 6s
Build mlibc (x86_64, mlibc-ansi-only)	1m 55s
Compile sysdeps (lyre)	1m 18s
Build mlibc (x86_64, mlibc-headers-only)	1m 0s
Compile sysdeps (keyronex)	1m 4s
Build mlibc (riscv64, mlibc)	2m 21s
Build mlibc (riscv64, mlibc-static)	3m 12s
Build mlibc (riscv64, mlibc-shared)	1m 53s
Build mlibc (riscv64, mlibc-ansi-only)	1m 49s
Build mlibc (riscv64, mlibc-headers-only)	1m 2s
Build mlibc (aarch64, mlibc)	2m 47s
Build mlibc (aarch64, mlibc-static)	2m 13s
Build mlibc (aarch64, mlibc-shared)	2m 12s
Build mlibc (aarch64, mlibc-ansi-only)	1m 55s
Build mlibc (aarch64, mlibc-headers-only)	1m 2s
	43m 29s

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