[mingw-gtk3] Refactor autoreconf handling

[Kalev Lember]

commit e6386322b9b0d5c9b8f0d76fad637e5caca39f8e
Author: David King <amigadave at amigadave.com>
Date:   Thu Oct 9 13:56:35 2014 +0100

    Refactor autoreconf handling

 mingw-gtk3.spec |   15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/mingw-gtk3.spec b/mingw-gtk3.spec
index e64787c..a21fc87 100644
--- a/mingw-gtk3.spec
+++ b/mingw-gtk3.spec
@@ -4,6 +4,10 @@
 # first two digits of version
 %define release_version %(echo %{version} | awk -F. '{print $1"."$2}')
 
+# Only enable if using patches that touches configure.ac,
+# Makefile.am or other build system related files
+%define enable_autoreconf 1
+
 Name:           mingw-gtk3
 Version:        3.14.3
 Release:        1%{?dist}
@@ -58,8 +62,12 @@ BuildRequires:  gtk2
 # Native one for gdk-pixbuf-csource
 BuildRequires:  gdk-pixbuf2-devel
 
-# Used by autoreconf.
-BuildRequires:  autoconf automake libtool gobject-introspection-devel
+%if 0%{?enable_autoreconf}
+BuildRequires:  autoconf
+BuildRequires:  automake
+BuildRequires:  gobject-introspection-devel
+BuildRequires:  libtool
+%endif
 
 
 %description
@@ -107,7 +115,9 @@ This package contains the MinGW Windows cross compiled GTK+ 3 library.
 %prep
 %setup -q -n gtk+-%{version}
 %patch0 -p1 -b .extract_strings
+%if 0%{?enable_autoreconf}
 autoreconf --install --force
+%endif
 
 
 %build
@@ -275,6 +285,7 @@ fi
 %changelog
 * Tue Oct 14 2014 David King <amigadave at amigadave.com> - 3.14.3-1
 - Update to 3.14.3
+- Refactor autoreconf handling
 
 * Tue Sep 23 2014 Erik van Pienbroek <epienbro at fedoraproject.org> - 3.14.0-1
 - Update to 3.14.0