add missing line continuation characters to linker pragma #2701

Job	Run time
CPU (Windows) (msvc, Debug)	11m 57s
macos-CPU (MacOS) (clang, Release)	3m 31s
macos-CPU (MacOS) (clang, Debug)	4m 7s
CPU (Windows) (msvc, Release)	14m 26s
CPU (gcc 11, Release, ASAN)	2m 24s
CPU (clang 16, Release)	2m 46s
CPU (gcc 11, Release)	2m 18s
CPU (gcc 13, Debug)	2m 21s
CPU (gcc 11, Debug)	2m 31s
CPU (gcc 12, Release, TSAN)	2m 40s
CPU (clang 16, Release, ASAN)	3m 8s
CPU (clang 16, Debug)	3m 20s
CI (CPU)	3s
CI (CPU) (MacOS)	4s
CI (CPU) (Windows)	0s
	55m 36s

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