graphicsmagick: improved to build a shared library if possible

graphic/graphicsmagick/graphicsmagick.conf

@@ -0,0 +1,18 @@
+# --- SDE-COPYRIGHT-NOTE-BEGIN ---
+# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
+#
+# Filename: package/.../graphicsmagick/graphicsmagick.conf
+# Copyright (C) 2012 The OpenSDE Project
+#
+# More information can be found in the files COPYING and README.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License. A copy of the
+# GNU General Public License can be found in the file COPYING.
+# --- SDE-COPYRIGHT-NOTE-END ---
+
+# build shared library if possible
+if [ "$SDECFG_STATIC" != 1 ]; then
+	var_append extraconfopt ' ' "--enable-shared"
+fi