Drop the clang patch which adds recognition of 'CC' suffixes as aliases

for --driver-mode=g++, since this was never upstreamed.  For backwards
compatibility, add a wrapper shell script.

MFC after:	1 week

contrib/llvm/patches/patch-02-add-CC-aliases.diff

@@ -1,23 +0,0 @@
-This patch adds "CC" and "clang-CC" to the list of program name aliases which
-invoke the C++ compiler.
-
-Introduced here: http://svnweb.freebsd.org/changeset/base/257109
-
-Index: tools/clang/tools/driver/driver.cpp
-===================================================================
---- tools/clang/tools/driver/driver.cpp
-+++ tools/clang/tools/driver/driver.cpp
-@@ -213,11 +213,13 @@ static const DriverSuffix *FindDriverSuffix(String
-       {"clang", nullptr},
-       {"clang++", "--driver-mode=g++"},
-       {"clang-c++", "--driver-mode=g++"},
-+      {"clang-CC", "--driver-mode=g++"},
-       {"clang-cc", nullptr},
-       {"clang-cpp", "--driver-mode=cpp"},
-       {"clang-g++", "--driver-mode=g++"},
-       {"clang-gcc", nullptr},
-       {"clang-cl", "--driver-mode=cl"},
-+      {"CC", "--driver-mode=g++"},
-       {"cc", nullptr},
-       {"cpp", "--driver-mode=cpp"},
-       {"cl", "--driver-mode=cl"},

contrib/llvm/tools/clang/tools/driver/driver.cpp

@@ -214,13 +214,11 @@ static const DriverSuffix *FindDriverSuffix(StringRef ProgName) {
       {"clang", nullptr},
       {"clang++", "--driver-mode=g++"},
       {"clang-c++", "--driver-mode=g++"},
-      {"clang-CC", "--driver-mode=g++"},
       {"clang-cc", nullptr},
       {"clang-cpp", "--driver-mode=cpp"},
       {"clang-g++", "--driver-mode=g++"},
       {"clang-gcc", nullptr},
       {"clang-cl", "--driver-mode=cl"},
-      {"CC", "--driver-mode=g++"},
       {"cc", nullptr},
       {"cpp", "--driver-mode=cpp"},
       {"cl", "--driver-mode=cl"},

usr.bin/clang/clang/CC.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+# $FreeBSD$
+# This file is in the public domain.
+exec /usr/bin/c++ "$@"

usr.bin/clang/clang/Makefile

@@ -18,9 +18,11 @@ LINKS=	${BINDIR}/clang ${BINDIR}/clang++ \
 MLINKS=	clang.1 clang++.1 \
 	clang.1 clang-cpp.1
 .if ${MK_CLANG_IS_CC} != "no"
+SCRIPTS=CC.sh
+SCRIPTSNAME=CC
+
 LINKS+=	${BINDIR}/clang ${BINDIR}/cc \
 	${BINDIR}/clang ${BINDIR}/c++ \
-	${BINDIR}/clang ${BINDIR}/CC \
 	${BINDIR}/clang ${BINDIR}/cpp
 MLINKS+= clang.1 cc.1 \
 	clang.1 c++.1 \