bsd.subdir.mk: improve `SUBDIR.${MK_FOO}` advice
- Remove superfluous whitespace by removing trailing whitespace before `\` (line continuation character) - Quote `SUBDIR.` to clarify the fact that this is a variable reference--not the end of a sentence.
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@ -125,7 +125,7 @@ SUBDIR:=${SUBDIR:u}
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.endif
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.endif
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.if defined(SUBDIR.)
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.if defined(SUBDIR.)
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.error ${.CURDIR}: Found variable SUBDIR. with value "${SUBDIR.}". This was \
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.error ${.CURDIR}: Found variable 'SUBDIR.' with value "${SUBDIR.}". This was\
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probably caused by using SUBDIR.$${MK_FOO} without including\
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probably caused by using SUBDIR.$${MK_FOO} without including\
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<src.opts.mk> or by using an invalid $${MK_FOO} option.
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<src.opts.mk> or by using an invalid $${MK_FOO} option.
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.endif
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.endif
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