patch 8.2.0290: running individual test differs from all tests

Problem:    Running individual test differs from all tests.
Solution:   Pass on environment variables. (Yee Cheng Chin, closes #5672)

src/testdir/Makefile

@@ -73,7 +73,7 @@ $(SCRIPTS) $(SCRIPTS_GUI) $(NEW_TESTS_RES): $(SCRIPTS_FIRST)
 # 	make test_largefile
 $(NEW_TESTS):
 	rm -f $@.res test.log messages
-	@MAKEFLAGS=--no-print-directory $(MAKE) -f Makefile $@.res
+	@MAKEFLAGS=--no-print-directory $(MAKE) -f Makefile $@.res VIMPROG=$(VIMPROG) XXDPROG=$(XXDPROG) SCRIPTSOURCE=$(SCRIPTSOURCE)
 	@cat messages
 	@if test -f test.log; then \
 		exit 1; \

src/testdir/README.txt

@@ -25,6 +25,8 @@ At 2), instead of running the test separately, it can be included in
 bit faster, because Vim doesn't have to be started, one Vim instance runs many
 tests.
 
+At 4), to run a test in GUI, add "GUI_FLAG=-g" to the make command.
+
 
 What you can use (see test_assert.vim for an example):
 

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    290,
 /**/
     289,
 /**/