patch 8.2.1792: Configure does not recognize Racket 6.1+

Problem:    Configure does not recognize Racket 6.1+.
Solution:   Add a check for "rktio". (closes #7062)
diff --git a/src/auto/configure b/src/auto/configure
index 37a60fa..13eaea6 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -5823,6 +5823,9 @@
 	  MZSCHEME_CFLAGS="-DMZ_PRECISE_GC"
 	elif test -f "${path}/libracket3m.a"; then
 	  MZSCHEME_LIBS="${path}/libracket3m.a"
+	  if test -f "${path}/librktio.a"; then
+	    MZSCHEME_LIBS="${MZSCHEME_LIBS} ${path}/librktio.a"
+	  fi
 	  MZSCHEME_CFLAGS="-DMZ_PRECISE_GC"
 	elif test -f "${path}/libracket.a"; then
 	  MZSCHEME_LIBS="${path}/libracket.a ${path}/libmzgc.a"
diff --git a/src/configure.ac b/src/configure.ac
index d262990..457f2b8 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -880,6 +880,9 @@
 	  MZSCHEME_CFLAGS="-DMZ_PRECISE_GC"
 	elif test -f "${path}/libracket3m.a"; then
 	  MZSCHEME_LIBS="${path}/libracket3m.a"
+	  if test -f "${path}/librktio.a"; then
+	    MZSCHEME_LIBS="${MZSCHEME_LIBS} ${path}/librktio.a"
+	  fi
 	  MZSCHEME_CFLAGS="-DMZ_PRECISE_GC"
 	elif test -f "${path}/libracket.a"; then
 	  MZSCHEME_LIBS="${path}/libracket.a ${path}/libmzgc.a"
diff --git a/src/version.c b/src/version.c
index 40a5ea8..33d39bd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1792,
+/**/
     1791,
 /**/
     1790,