./configure'd universal-ctags name not being used to tag source

Same goes for exuberant-ctags.

In the non-Windwoes version of start_ctags(), argv[0] is never changed from the default of "ctags".
This works just fine if you've installed uctags as ctags.

Here's a quick patch. I did it the easiest way.  Since ctagscom is global, I didn't bother saving and restoring the original value, but that may be the better way to do it.
Here's the patch (and attached). Apologies if it's not formatted correctly, I don't have the opportunity to submit patches very often.

======================================================================

    I, David Panariti, hereby disclaim all copyright interest in my
    changes and enhancements to GLOBAL (herein called
    the "Program").

    I affirm that I have no other intellectual property interest that
    would undermine this release, or the use of the Program, and will
    do nothing to undermine it in the future.  I represent that the
    changes and enhancements are my own and not a copy of someone
    else's work.

    David Panariti
    02-June-2016

======================================================================


Regards,
davep
[email protected]

========================================================================
--- exuberant-ctags.c 2016-03-27 00:04:42.000000000 -0400
+++ /home/dpanarit/local/build/global-6.5.4/plugin-factory/exuberant-ctags.c     2016-06-02 16:31:42.440670746 -0400
@@ -195,11 +195,11 @@
{
    int opipe[2], ipipe[2];
    char *path = param->getconf("ctagscom");
-
    if (path && strlen(path) > 0 && strcmp(path, "no") != 0)
          ctagscom = path;
    if (!ctagscom || !strlen(ctagscom) || !strcmp(ctagscom, "no"))
         param->die(ctagsnotfound);
+    argv[0] = ctagscom;
    argv[1] = malloc(sizeof(LANGMAP_OPTION) + strlen(param->langmap));
    if (argv[1] == NULL)
          param->die("short of memory.");

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--- exuberant-ctags.c	2016-03-27 00:04:42.000000000 -0400
+++ /home/dpanarit/local/build/global-6.5.4/plugin-factory/exuberant-ctags.c	2016-06-02 16:31:42.440670746 -0400
@@ -195,11 +195,11 @@
 {
 	int opipe[2], ipipe[2];
 	char *path = param->getconf("ctagscom");
-
 	if (path && strlen(path) > 0 && strcmp(path, "no") != 0)
 		ctagscom = path;
 	if (!ctagscom || !strlen(ctagscom) || !strcmp(ctagscom, "no"))
 		param->die(ctagsnotfound);
+	argv[0] = ctagscom;
 	argv[1] = malloc(sizeof(LANGMAP_OPTION) + strlen(param->langmap));
 	if (argv[1] == NULL)
 		param->die("short of memory.");