build: fix 'make distcheck' with pdwtags installed
I am getting this failure with 'make distcheck': GEN ../../src/remote_protocol-structs /bin/sh: ../../src/remote_protocol-structs-t: Permission denied make[4]: *** [../../src/remote_protocol-structs] Error 1 since it attempts a sub-run of a VPATH 'make check' where $(srcdir) is intentionally read-only. I'm not sure which commit introduced the problem, although I suspect it was around 62dee6fa when I refactored protocol struct checking to be more powerful. $(@F) is required by POSIX, and although it is not yet portable to all make implementations, we already require GNU make. * src/Makefile.am (PDWTAGS): Generate temp file into current directory, since $(srcdir) is read-only during distcheck.
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