cad/PrusaSlicer: Fix build and remove BROKEN

This applies a patch from upstream to fix compilation with recent boost
versions.

cad/PrusaSlicer/Makefile

@@ -24,8 +24,6 @@ LIB_DEPENDS=	libtbb.so:devel/onetbb \
 BUILD_DEPENDS=	cereal>=1.3.0.10:devel/cereal \
 		cgal>=5.0.2:math/cgal
 
-BROKEN=		Fails to compile: implicit instantiation of undefined template 'std::basic_ifstream<char>'
-
 USES=		cmake cpe desktop-file-utils eigen:3 gettext gl iconv pkgconfig
 CPE_VENDOR=	prusa3d
 CMAKE_ARGS+=	-DwxWidgets_CONFIG_EXECUTABLE="${WX_CONFIG}" \

cad/PrusaSlicer/files/patch-tests_fff_print_test_data.cpp

@@ -0,0 +1,28 @@
+commit 926ae0471800abd1e5335e251a5934570eb8f6ff
+Author: Vojtech Bubnik <bubnikv@gmail.com>
+Date:   2022-04-25 11:32:03 +0200
+
+    Follow-up to 408e56f0390f20aaf793e0aa0c70c4d9544401d4
+    Fixing compilation of tests on latest GCC/boost
+
+diff --git tests/fff_print/test_data.cpp tests/fff_print/test_data.cpp
+index 32e31c264..f7077007d 100644
+--- tests/fff_print/test_data.cpp
++++ tests/fff_print/test_data.cpp
+@@ -11,6 +11,7 @@
+ #include <string>
+ 
+ #include <boost/nowide/cstdio.hpp>
++#include <boost/nowide/fstream.hpp>
+ #include <boost/filesystem.hpp>
+ #include <libslic3r/ModelArrange.hpp>
+ 
+@@ -286,7 +287,7 @@ std::string gcode(Print & print)
+     print.set_status_silent();
+     print.process();
+     print.export_gcode(temp.string(), nullptr, nullptr);
+-    std::ifstream t(temp.string());
++    boost::nowide::ifstream t(temp.string());
+ 	std::string str((std::istreambuf_iterator<char>(t)), std::istreambuf_iterator<char>());
+ 	boost::nowide::remove(temp.string().c_str());
+ 	return str;