gbuild: remove trailing \ that is apparently...

... causing LO patched make 3.82 to fail with "Malformed target-specific
variable definition" on the next line.
(cherry picked from commit c854d369)
Signed-off-by: Bjoern Michaelsen <bjoern.michaelsen@canonical.com>

solenv/gbuild/platform/WNT_INTEL_MSC.mk

@@ -636,7 +636,7 @@ $(call gb_JunitTest_JunitTest_platform_longpathname_hack,$(1))
 $(call gb_JunitTest_get_target,$(1)) : DEFS := \
 	-Dorg.openoffice.test.arg.soffice="$$$${OOO_TEST_SOFFICE:-path:`cat $(call gb_JunitTest_get_target,$(1)).instpath`/opt/OpenOffice.org 3/program/soffice.exe}" \
 	-Dorg.openoffice.test.arg.env=PATH \
-	-Dorg.openoffice.test.arg.user=file:///$(call gb_JunitTest_get_userdir,$(1)) \
+	-Dorg.openoffice.test.arg.user=file:///$(call gb_JunitTest_get_userdir,$(1))
 
 endef