Fix document generation on Windows (using Git Bash)

* Made finddesc.lua execute commands using `sh -c 'command'`, which ensures that Unix-like shell is used instead of cmd.exe
* Made finddesc.lua avoid a situation where it would end up with a double '/' in `outpath`
* Redirect output of deleting the document to null to avoid pointless "No such file or directory" errors.

build.sh

@@ -8,7 +8,7 @@ cat target/version.lua target/init.lua > target/tinit.lua
 mv target/tinit.lua target/init.lua
 cp -r service/ lib/ cfg/ target/
 rm target/version.lua
-rm -r doc/
+rm -r doc/ &>/dev/null
 $LUA finddesc.lua doc/ $(find lib/ module/ -type f|sort)
 $LUA gendoc.lua target/doc/kernel.dict $(find module/ -type f|sort)
 pandoc doc/apidoc.md docs-metadata.yml --template=template.tex -o doc/apidoc.pdf

finddesc.lua

@@ -36,7 +36,8 @@ local function formatDocs(fd)
  return rs
 end
 
-os.execute("mkdir -p "..outpath)
+os.execute("sh -c 'mkdir -p "..outpath .. "'")
+if outpath:sub(#outpath) == "/" then outpath = outpath:sub(1, #outpath - 1) end
 local ad = io.open(outpath.."/apidoc.md","w")
 
 for k,v in pairs(tA) do
@@ -44,7 +45,7 @@ for k,v in pairs(tA) do
  local ds = formatDocs(fd)
  print(string.format("%s: %i",v,ds:len()))
  if ds and ds:len() > 0 then
-  os.execute("mkdir -p $(dirname \""..outpath.."/"..v.."\")")
+  os.execute("sh -c 'mkdir -p $(dirname \""..outpath.."/"..v.."\")'")
   local f = io.open(outpath.."/"..v:gsub("%.lua$",".md"),"wb")
   f:write(string.format("# %s\n\n",v))
   f:write(ds)