tests: fix "export var=val"

Some shells do not like "export var=val"; the right way to write
it is to do an assignment and then export just the variable name.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/t9301-fast-export.sh

@@ -185,8 +185,8 @@ test_expect_success 'submodule fast-export | fast-import' '
 
 '
 
-export GIT_AUTHOR_NAME='A U Thor'
-export GIT_COMMITTER_NAME='C O Mitter'
+GIT_AUTHOR_NAME='A U Thor'; export GIT_AUTHOR_NAME
+GIT_COMMITTER_NAME='C O Mitter'; export GIT_COMMITTER_NAME
 
 test_expect_success 'setup copies' '
 

t/test-lib.sh

@@ -82,7 +82,7 @@ do
 	-i|--i|--im|--imm|--imme|--immed|--immedi|--immedia|--immediat|--immediate)
 		immediate=t; shift ;;
 	-l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
-		export GIT_TEST_LONG=t; shift ;;
+		GIT_TEST_LONG=t; export GIT_TEST_LONG; shift ;;
 	-h|--h|--he|--hel|--help)
 		help=t; shift ;;
 	-v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)