devel/gcvs: unbreak with libc++ 3.9
AppGlue.cpp:263:9: error: cannot initialize a variable of type 'char *' with an
rvalue of type 'const char *'
char *login = strchr(ccvsroot, '@');
^ ~~~~~~~~~~~~~~~~~~~~~
CvsArgs.cpp:201:16: error: call to 'strchr' is ambiguous
bool hasLF = strchr(newarg, '\n') != 0L;
^~~~~~
CvsArgs.cpp:210:19: error: call to 'strchr' is ambiguous
bool hasSpace = strchr(newarg, ' ') != 0L;
^~~~~~
TextBinary.cpp:466:8: error: cannot initialize a variable of type 'char *' with
an rvalue of type 'const char *'
char *tmp = strrchr(file, '.');
^ ~~~~~~~~~~~~~~~~~~
UCvsFiles.cpp:2020:12: error: call to 'strchr' is ambiguous
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