tests: remove no-op full-svn-test target

git-svn has not supported GIT_SVN_NO_OPTIMIZE_COMMITS for
the "set-tree" sub-command in 9 years since commit 490f49ea58
("git-svn: remove optimized commit stuff for set-tree").

So remove this target and TSVN variable to avoid confusion.

ref: http://mid.gmane.org/56C9B7B7.7030406@f2.dion.ne.jp

Helped-by: Kazutoshi Satoda <k_satoda@f2.dion.ne.jp>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/Makefile

@@ -27,7 +27,6 @@ PERL_PATH_SQ = $(subst ','\'',$(PERL_PATH))
 TEST_RESULTS_DIRECTORY_SQ = $(subst ','\'',$(TEST_RESULTS_DIRECTORY))
 
 T = $(sort $(wildcard t[0-9][0-9][0-9][0-9]-*.sh))
-TSVN = $(sort $(wildcard t91[0-9][0-9]-*.sh))
 TGITWEB = $(sort $(wildcard t95[0-9][0-9]-*.sh))
 THELPERS = $(sort $(filter-out $(T),$(wildcard *.sh)))
 
@@ -77,11 +76,6 @@ aggregate-results:
 		echo "$$f"; \
 	done | '$(SHELL_PATH_SQ)' ./aggregate-results.sh
 
-# we can test NO_OPTIMIZE_COMMITS independently of LC_ALL
-full-svn-test:
-	$(MAKE) $(TSVN) GIT_SVN_NO_OPTIMIZE_COMMITS=1 LC_ALL=C
-	$(MAKE) $(TSVN) GIT_SVN_NO_OPTIMIZE_COMMITS=0 LC_ALL=en_US.UTF-8
-
 gitweb-test:
 	$(MAKE) $(TGITWEB)