Unbreak multimedia/assimp on armv6 and aarch64

[krion]

Summary

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216815

Approved by maintainer.

head/multimedia/assimp/Makefile

 # Created by: Yuri <[e-mail]>
 # $FreeBSD$
 
 PORTNAME=       assimp
 PORTVERSION=    3.3.1
 DISTVERSIONPREFIX=      v
 PORTREVISION=   1
 CATEGORIES=     multimedia
 
 MAINTAINER=     [e-mail]
 COMMENT=        Library to import various 3D model formats in a uniform manner
 
 LICENSE=        BSD3CLAUSE
 LICENSE_FILE=   ${WRKSRC}/LICENSE
 
-BROKEN_aarch64=                Does not compile: error: non-constant-expression cannot be narrowed from type int8_t to char
-BROKEN_armv6=                Does not compile: error: non-constant-expression cannot be narrowed from type int8_t to char
 BROKEN_powerpc64=       Does not build
-BROKEN_armv6=                Does not compile: error: ByteSwap has not been declared
 
 USES=           cmake compiler:c++11-lib pkgconfig
 USE_GITHUB=             yes
 USE_LDCONFIG=   yes
 
 # CMAKE_ARGS instructs cmake to skip runtime path removal during install
 CMAKE_ARGS+=    -DCMAKE_SKIP_RPATH:BOOL=ON -DASSIMP_BUILD_TESTS:BOOL=OFF
 

head/multimedia/assimp/files/patch-code_BlenderDNA.cpp

+--- code/BlenderDNA.cpp.orig        2017-02-05 09:22:26 UTC
++++ code/BlenderDNA.cpp
+@@ -55,10 +55,10 @@ using namespace Assimp::Formatter;
+ 
+ bool match4(StreamReaderAny& stream, const char* string) {
+     char tmp[] = {
+-        (stream).GetI1(),
+-        (stream).GetI1(),
+-        (stream).GetI1(),
+-        (stream).GetI1()
++        static_cast<char>((stream).GetI1()),
++        static_cast<char>((stream).GetI1()),
++        static_cast<char>((stream).GetI1()),
++        static_cast<char>((stream).GetI1())
+     };
+     return (tmp[0]==string[0] && tmp[1]==string[1] && tmp[2]==string[2] && tmp[3]==string[3]);
+ }
+@@ -345,10 +345,10 @@ void SectionParser :: Next()
+     stream.SetCurrentPos(current.start + current.size);
+ 
+     const char tmp[] = {
+-        stream.GetI1(),
+-        stream.GetI1(),
+-        stream.GetI1(),
+-        stream.GetI1()
++        static_cast<char>(stream.GetI1()),
++        static_cast<char>(stream.GetI1()),
++        static_cast<char>(stream.GetI1()),
++        static_cast<char>(stream.GetI1())
+     };
+     current.id = std::string(tmp,tmp[3]?4:tmp[2]?3:tmp[1]?2:1);
+