hwloc: misc.h: Fix hwloc_strncasecmp() with some icc

tolower needs <ctype.h>

Thanks to Ralph Castain for reporting the failure.

(cherry picked from commit open-mpi/hwloc@038c372a58)
Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

opal/mca/hwloc/hwloc191/hwloc/NEWS

@@ -17,6 +17,12 @@ bug fixes (and other actions) for each version of hwloc since version
 in v0.9.1).
 
 
+Version 1.9.2
+-------------
+* Fix some build failures in private/misc.h.
+  Thanks to Pavan Balaji and Ralph Castain for the reports.
+
+
 Version 1.9.1
 -------------
 * Fix a crash when the PCI locality is invalid. Attach to the root object

opal/mca/hwloc/hwloc191/hwloc/config/hwloc.m4

@@ -353,6 +353,7 @@ EOF])
     AC_CHECK_HEADERS([unistd.h])
     AC_CHECK_HEADERS([dirent.h])
     AC_CHECK_HEADERS([strings.h])
+    AC_CHECK_HEADERS([ctype.h])
     
     AC_CHECK_FUNCS([strncasecmp], [
       _HWLOC_CHECK_DECL([strncasecmp], [

opal/mca/hwloc/hwloc191/hwloc/include/private/misc.h

@@ -19,6 +19,10 @@
 #ifdef HAVE_STRINGS_H
 #include <strings.h>
 #endif
+#else
+#ifdef HAVE_CTYPE_H
+#include <ctype.h>
+#endif
 #endif
 
 /* Compile-time assertion */