[nginx] Configure: fixed clang detection on MINIX.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/325b3042edd6
branches:  
changeset: 7161:325b3042edd6
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Thu Nov 23 16:33:40 2017 +0300
description:
Configure: fixed clang detection on MINIX.

As per POSIX, basic regular expressions have no alternations, and the
interpretation of the "\|" construct is undefined.  At least on MINIX
and Solaris grep interprets "\|" as literal "|", and not as an alternation
as GNU grep does.  Removed such constructs introduced in f1daa0356a1d.
This fixes clang detection on MINIX.

diffstat:

 auto/cc/clang |  2 +-
 auto/cc/name  |  6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diffs (28 lines):

diff --git a/auto/cc/clang b/auto/cc/clang
--- a/auto/cc/clang
+++ b/auto/cc/clang
@@ -5,7 +5,7 @@
 # clang
 
 
-NGX_CLANG_VER=`$CC -v 2>&1 | grep '\(clang\|LLVM\) version' 2>&1 \
+NGX_CLANG_VER=`$CC -v 2>&1 | grep 'version' 2>&1 \
                            | sed -e 's/^.* version \(.*\)/\1/'`
 
 echo " + clang version: $NGX_CLANG_VER"
diff --git a/auto/cc/name b/auto/cc/name
--- a/auto/cc/name
+++ b/auto/cc/name
@@ -44,7 +44,11 @@ elif `$CC -v 2>&1 | grep 'gcc version' >
     NGX_CC_NAME=gcc
     echo " + using GNU C compiler"
 
-elif `$CC -v 2>&1 | grep '\(clang\|LLVM\) version' >/dev/null 2>&1`; then
+elif `$CC -v 2>&1 | grep 'clang version' >/dev/null 2>&1`; then
+    NGX_CC_NAME=clang
+    echo " + using Clang C compiler"
+
+elif `$CC -v 2>&1 | grep 'LLVM version' >/dev/null 2>&1`; then
     NGX_CC_NAME=clang
     echo " + using Clang C compiler"