c-index-test/Makefile: Use -isystem instead of -I on $(LIBXML2_INC) with -Wdocumentation.
-Wdocumentation won't seek -isystem. LIBXML2's headers in a certain distro might be incompatible to -Wdocumentation. FIXME: Could autoconf detect clang or availability of -isystem? llvm-svn: 185927
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