Correct POFILE definition in ExtensionTarget.mk
Correct POFILE definition in ExtensionTarget.mk

For help and help tree files.
Result of $(or $(4),$(3)) can be only a single
filename without relative path and this case $(dir...)
retrun with './'. Otherwise $(dir...) return with the
directory of the file with '/' ending.

Change-Id: Ia636b314779b907796a3395a877e7bc7b1a47292

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core