treewide: remove unnecessary inclusion of gettext.h

Looking at things from the opposite angle of the last patch, we had a
few files that were including gettext.h and perhaps needed it at some
point in history, but no longer require it.  Remove the include.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

progress.c

@@ -10,7 +10,6 @@
 
 #define GIT_TEST_PROGRESS_ONLY
 #include "cache.h"
-#include "gettext.h"
 #include "progress.h"
 #include "strbuf.h"
 #include "trace.h"

t/helper/test-parse-pathspec-file.c

@@ -1,7 +1,6 @@
 #include "test-tool.h"
 #include "parse-options.h"
 #include "pathspec.h"
-#include "gettext.h"
 
 int cmd__parse_pathspec_file(int argc, const char **argv)
 {

t/helper/test-progress.c

@@ -19,7 +19,6 @@
  */
 #define GIT_TEST_PROGRESS_ONLY
 #include "test-tool.h"
-#include "gettext.h"
 #include "parse-options.h"
 #include "progress.h"
 #include "strbuf.h"

t/helper/test-run-command.c

@@ -16,7 +16,6 @@
 #include "string-list.h"
 #include "thread-utils.h"
 #include "wildmatch.h"
-#include "gettext.h"
 
 static int number_callbacks;
 static int parallel_next(struct child_process *cp,