OpenXcom: fix gcc6 build

srcpkgs/OpenXcom/patches/fix-gcc6-ambigous_abs.patch

@@ -0,0 +1,19 @@
+Disambiguate abs() for gcc6
+
+--- src/Geoscape/Globe.cpp	2014-06-13 21:14:43.000000000 +0200
++++ src/Geoscape/Globe.cpp	2016-10-03 16:35:38.988290974 +0200
+@@ -1390,12 +1390,12 @@
+ 
+ 	if (fabs(sx)<0.01)
+ 	{
+-		seg = abs( sy/(2*M_PI)*48 );
++		seg = abs((int)( sy/(2*M_PI)*48 ));
+ 		if (seg == 0) ++seg;
+ 	}
+ 	else
+ 	{
+-		seg = abs( sx/(2*M_PI)*96 );
++		seg = abs((int)( sx/(2*M_PI)*96 ));
+ 		if (seg == 0) ++seg;
+ 	}
+