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pcre2grep.1 - fix warning about undefined macro 0 #900

Job	Run time
Windows (Win32)	2m 1s
Bazel	0s
manyconfig	26m 58s
perl	17s
GCC -O0	2m 1s
CMake unity build	40s
GCC -Os, old Autotools	1m 0s
Clang (-O0)	2m 26s
Clang (-O2)	3m 52s
GCC -O3	56s
Check autogenerated file freshness	20s
MSYS2	0s
Multiarch	0s
Windows (x64)	2m 4s
GCC -Os, CMake+ninja, no JIT	1m 4s
Zig	0s
	43m 39s

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