[Bug 217001] graphics/gle-graphics: fails to build with lang/gcc6 or later

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217001

            Bug ID: 217001
           Summary: graphics/gle-graphics: fails to build with lang/gcc6
                    or later
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
               URL: https://gcc.gnu.org/gcc-6/porting_to.html
                OS: Any
            Status: New
          Keywords: needs-patch
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
                CC: gerald at FreeBSD.org, nivit at FreeBSD.org
                CC: gerald at FreeBSD.org, nivit at FreeBSD.org

op_def.cpp:224:29: error: narrowing conversion of '4278190080u' from 'unsigned
int' to 'int' inside { } [-Wnarrowing]
   { "END",  typ_end,  1, 1} };
                             ^

build log: http://sprunge.us/QNSi

clang++ -std=c++11 has a more clear error message:

op_def.cpp:205:29: error: constant expression evaluates to 4278190080 which
cannot be narrowed to
      type 'int' [-Wc++11-narrowing]
                { "CLEAR",      typ_switch,     1, GLE_FILL_CLEAR },
                                                   ^~~~~~~~~~~~~~
./color.h:63:25: note: expanded from macro 'GLE_FILL_CLEAR'
#define GLE_FILL_CLEAR  0XFF000000
                        ^~~~~~~~~~
op_def.cpp:205:29: note: insert an explicit cast to silence this issue
                { "CLEAR",      typ_switch,     1, GLE_FILL_CLEAR },
                                                   ^~~~~~~~~~~~~~
                                                   static_cast<int>( )
./color.h:63:25: note: expanded from macro 'GLE_FILL_CLEAR'
#define GLE_FILL_CLEAR  0XFF000000
                        ^~~~~~~~~~

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