Add correct input for helpex

Helpex waits for a file which contains path
of po file not a path directly
Delete unneeded slash

Change-Id: I890f6a51ebef1ae40647859b11ab4c46c02eb13b
Reviewed-on: https://gerrit.libreoffice.org/733Reviewed-by: Andras Timar <atimar@suse.com>
Tested-by: Andras Timar <atimar@suse.com>

solenv/gbuild/ExtensionTarget.mk

@@ -300,9 +300,9 @@ $(call gb_ExtensionTarget_get_rootdir,$(1))/help/$(5).done : \
 ifneq ($(strip $(gb_WITH_LANG)),)
 ifneq ($(filter-out en-US,$(5)),)
 $(call gb_ExtensionTarget_get_workdir,$(1))/help/$(5)/$(3) : \
-	POFILE := $(gb_POLOCATION)/$(5)/$(subst $(SRCDIR),,$(2))/$(subst /$(lastword $(subst /, ,$(3))),.po,$(3))
+	POFILE := $(gb_POLOCATION)/$(5)$(subst $(SRCDIR),,$(2))/$(subst /$(lastword $(subst /, ,$(3))),.po,$(3))
 $(call gb_ExtensionTarget_get_workdir,$(1))/help/$(5)/$(3) : \
-        $(gb_POLOCATION)/$(5)/$(subst $(SRCDIR),,$(2))/$(subst /$(lastword $(subst /, ,$(3))),.po,$(3))
+        $(gb_POLOCATION)/$(5)$(subst $(SRCDIR),,$(2))/$(subst /$(lastword $(subst /, ,$(3))),.po,$(3))
 endif
 endif
 $(call gb_ExtensionTarget_get_workdir,$(1))/help/$(5)/$(3) : \
@@ -314,8 +314,11 @@ $(call gb_ExtensionTarget_get_workdir,$(1))/help/$(5)/$(3) : \
 	$$(call gb_Helper_abbreviate_dirs, \
         mkdir -p $$(dir $$@) && \
         $(if $(filter-out en-US,$(5)), \
+            MERGEINPUT=`$(gb_MKTEMP)` && \
+            echo $$(POFILE) > $$$${MERGEINPUT} && \
             $(gb_ExtensionTarget_HELPEXCOMMAND) -i $$< -o $$@ -l $(5) \
-                -m $$(POFILE), \
+                -m $$$${MERGEINPUT} && \
+            rm -rf $$$${MERGEINPUT}, \
             cp $$< $$@))
 
 endef