kmod.mk: Use portable printf '%s' over non-portable echo -n
Whilst /bin/echo on macOS and Linux implement -n, as do the builtin echos in bash and zsh, the builtin echo in dash does not, causing the first line of the output to be -n foo rather than just foo, and there to be an extra newline in the output and thus blank line, both of which result in "Symbol ... is not present in *.kld" warnings appearing in the build output (once for -n foo and once for the empty string for each module where EXPORT_SYMS is a list of symbols). MFC after: 1 week
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@ -266,7 +266,7 @@ ${FULLPROG}: ${OBJS} ${BLOB_OBJS}
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.if ${EXPORT_SYMS} == NO
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:> export_syms
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.elif !exists(${.CURDIR}/${EXPORT_SYMS})
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echo -n "${EXPORT_SYMS:@s@$s${.newline}@}" > export_syms
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printf '%s' "${EXPORT_SYMS:@s@$s${.newline}@}" > export_syms
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.else
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grep -v '^#' < ${EXPORT_SYMS} > export_syms
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.endif
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