build: Fix theoretical infinite loops
Add error-checking to 'cd' in a few cases where omitting the checks might result in an infinite loop. Closes #535
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Daniel Stenberg

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80562083da
@@ -99,13 +99,13 @@ libcurl-symbols.3: $(srcdir)/symbols-in-versions $(srcdir)/mksymbolsmanpage.pl
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perl $(srcdir)/mksymbolsmanpage.pl < $(srcdir)/symbols-in-versions > $@
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html: $(HTMLPAGES)
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cd opts; make html
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cd opts && make html
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.3.html:
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$(MAN2HTML)
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pdf: $(PDFPAGES)
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cd opts; make pdf
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cd opts && make pdf
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.3.pdf:
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@(foo=`echo $@ | sed -e 's/\.[0-9]$$//g'`; \
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