[Bug 216215] astro/gpsbabel: fails to build with clang 4.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216215

--- Comment #4 from Jan Beich (mail not working) <jbeich at FreeBSD.org> ---
Comment on attachment 179281
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=179281
Proposed patch

nullptr is only available with -std=c++11 or later which this port doesn't
pass. libc++ is unaffected due to using surrogate nullptr in C++98 mode unlike
libstdc++. GCC defaults to C++98 before 6.0, so the fix would break FreeBSD on
powerpc*/mips*/sparc64, DragonFly and users who forced lang/gcc or lang/gcc5.

bushnell.cc: In function 'unsigned int bushnell_get_icon_from_name(QString)':
bushnell.cc:138:39: error: 'nullptr' was not declared in this scope
   for (t = bushnell_icons; t->icon != nullptr; t++) {
                                       ^
bushnell.cc: In function 'const char* bushnell_get_name_from_symbol(int)':
bushnell.cc:150:39: error: 'nullptr' was not declared in this scope
   for (t = bushnell_icons; t->icon != nullptr; t++) {
                                       ^

Note, NULL is promoted to nullptr with -std=c++11 on FreeBSD since 9.1 (see
base r228918).

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