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

solenv/bin/modules/installer.pm

@@ -126,7 +126,8 @@ sub run {
     # Creating the log directory
     ######################################
 
-    my $loggingdir = installer::systemactions::create_directories("logging", "");
+    my $empty = "";
+    my $loggingdir = installer::systemactions::create_directories("logging", \$empty);
     $loggingdir = $loggingdir . $installer::globals::separator;
     $installer::globals::exitlog = $loggingdir;
 
@@ -176,7 +177,7 @@ sub run {
     # FIXME: It would be better to use installer::systemactions::remove_complete_directory
     #        Though, we would need to remove only the lang-specific subdirectory for langpacks and helppacks
     rmdir $oldloggingdir;
-    $loggingdir = installer::systemactions::create_directories("logging", "");
+    $loggingdir = installer::systemactions::create_directories("logging", \$empty);
     $loggingdir = $loggingdir . $installer::globals::separator;
     $installer::globals::exitlog = $loggingdir;
 

solenv/bin/modules/installer/windows/mergemodule.pm

@@ -1101,7 +1101,8 @@ sub change_file_table
     # Unpacking the MergeModule.CABinet (only once)
     # Unpacking into temp directory. Warning: expand.exe has problems with very long unpack directories.
 
-    my $unpackdir = installer::systemactions::create_directories("cab", "");
+    my $empty = "";
+    my $unpackdir = installer::systemactions::create_directories("cab", \$empty);
     push(@installer::globals::removedirs, $unpackdir);
     $unpackdir = $unpackdir . $installer::globals::separator . $mergemodulegid;