detect HP-UX when configuring


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22077 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 3bd7496..8c6d697 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -111,6 +111,9 @@
   *-*-freebsd*) 
     llvm_cv_os_type="FreeBSD" 
     llvm_cv_platform_type="Unix" ;;
+  *-*-hpux*) 
+    llvm_cv_os_type="HP-UX" 
+    llvm_cv_platform_type="Unix" ;;
   *-*-interix*) 
     llvm_cv_os_type="Interix"
     llvm_cv_platform_type="Unix" ;;