warning C4805 unsafe mix of type sal_Bool and type bool

Change-Id: I00064edb5105ede4bdf6a0cdec4bab00cdd52331
installer: the perl is borked

Apparently the $$languagesref in create_directories results in the full
path to services.rdb when called from mergemodules.pm as

 my $unpackdir = installer::systemactions::create_directories("cab", "");

... which apparently means that there's some variable whose name is the
empty string and whose value is the path to services.rdb.

Add some mysterious workaround suggested by mmeeks.

Change-Id: I6ba203f5cc44786969795eebab5359d5e9a8a12a