more Linux fixes. Couple issues found: 1) Rescanning SDKs causes deadlock. 2) SDK cache is not working for Linux 3) Can't import when SBS is not installed (and there's not error msg)
bin.includes = plugin.xml,\
html/,\
introductionTOC.xml,\
performanceTOC.xml,\
symbolsTOC.xml,\
pragmas_x86TOC.xml,\
pragmasTOC.xml,\
c_behaviorTOC.xml,\
c_compilerTOC.xml,\
cmd_lineTOC.xml,\
compilerTOC.xml,\
cpp_behaviorTOC.xml,\
cpp_compilerTOC.xml,\
cpp_embTOC.xml,\
errorsTOC.xml,\
META-INF/,\
book.css,\
index/
src.includes = c_behaviorTOC.xml,\
c_compilerTOC.xml,\
cmd_lineTOC.xml,\
compilerTOC.xml,\
cpp_behaviorTOC.xml,\
cpp_compilerTOC.xml,\
cpp_embTOC.xml,\
META-INF/,\
html/,\
introductionTOC.xml,\
performanceTOC.xml,\
symbolsTOC.xml,\
pragmas_x86TOC.xml,\
pragmasTOC.xml,\
plugin.xml,\
errorsTOC.xml,\
book.css