Import upstream patch to fix the detection of clang's version number.

Our clang reports itself as "FreeBSD clang version x.y.z" instead of just
"clang version x.y.z", which was preventing the sed pattern used in the
configure script from matching and thus QT_CLANG_MAJOR_VERSION and
QT_CLANG_MINOR_VERSION were never defined. One of the consequences is that
tests for those values in mkspecs later always failed, which led to some
features such as C++14 support being disabled.

PR:		210327
MFH:		2016Q3

devel/qmake5/Makefile

@@ -2,6 +2,7 @@
 
 PORTNAME=	qmake
 DISTVERSION=	${QT5_VERSION}
+PORTREVISION=	1
 CATEGORIES=	devel
 PKGNAMEPREFIX=	qt5-
 

devel/qmake5/files/patch-configure

@@ -1,6 +1,27 @@
---- ./configure.orig	2013-10-22 01:49:15.000000000 -0700
-+++ ./configure	2013-11-04 07:40:28.945418565 -0800
-@@ -4194,11 +4194,11 @@
+The first two hunks make sure only qmake is build, as the rest of Qt is built
+in other ports.
+
+The last hunk is backported from upstream:
+
+commit a9474d1260a8c8cc9eae14f2984098919d9684e5
+Author: Raphael Kubo da Costa <rakuco@FreeBSD.org>
+Date:   Tue Aug 23 20:25:14 2016 +0200
+
+    configure: Correctly detect clang's version on FreeBSD
+
+    "clang -v" on FreeBSD reports something like "FreeBSD clang version
+    x.y.z [...]" instead of just "clang version x.y.z [...]", which fails to
+    match the sed pattern in the configure script, resulting in qconfig.pri
+    having no clang version defined.
+
+    Augment the pattern so that both version strings match.
+
+    Change-Id: I5f38f8480f4b1156ca7147e32c1157a009557035
+    Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
+
+--- configure.orig	2015-10-13 04:35:07 UTC
++++ configure
+@@ -4038,11 +4038,11 @@ if true; then ###[ '!' -f "$outpath/bin/
          fi
          echo "QMAKESPEC = $adjqmakespec" >> "$mkfile"
          echo "QT_VERSION = $QT_VERSION" >> "$mkfile"
@@ -15,11 +36,20 @@
          echo "EXEEXT = $EXEEXT" >> "$mkfile"
          echo "RM_F = rm -f" >> "$mkfile"
          echo "RM_RF = rm -rf" >> "$mkfile"
-@@ -4214,6 +4214,7 @@
- 	    rm "$mkfile.tmp"
+@@ -4061,6 +4061,7 @@ if true; then ###[ '!' -f "$outpath/bin/
+             fi
          fi
      done
 +    exit 0
  
-     (cd "$outpath/qmake"; "$MAKE") || exit 2
- fi # Build qmake
+     if [ "$OPT_VERBOSE" = yes ]; then
+         # Show the output of make
+@@ -6474,7 +6472,7 @@ case "$QMAKE_CONF_COMPILER" in
+     # Clang
+     COMPILER_VERSION=`${QMAKE_CONF_COMPILER} -v 2>&1 | sed -n -E '
+ /^Apple (clang|LLVM) version /{s///; s/^([0-9]*)\.([0-9]*).*$/QT_APPLE_CLANG_MAJOR_VERSION=\1; QT_APPLE_CLANG_MINOR_VERSION=\2/;p;q;}
+-/^clang version /{s///; s/^([0-9]*)\.([0-9]*).*$/QT_CLANG_MAJOR_VERSION=\1; QT_CLANG_MINOR_VERSION=\2/;p;q;}'`
++/^(FreeBSD )?clang version /{s///; s/^([0-9]*)\.([0-9]*).*$/QT_CLANG_MAJOR_VERSION=\1; QT_CLANG_MINOR_VERSION=\2/;p;q;}'`
+     eval "$COMPILER_VERSION"
+     ;;
+ *icpc)