libsysprof-capture: Use strlcpy() instead of g_strlcpy()

If the system doesn’t provide `strlcpy()` (FreeBSD does, Linux doesn’t),
use an inbuilt copy instead.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Helps: #40

meson.build

@@ -91,6 +91,8 @@ if cc.has_header('execinfo.h')
   config_h.set10('HAVE_EXECINFO_H', true)
 endif
 
+config_h.set('HAVE_STRLCPY', cc.has_function('strlcpy'))
+
 if get_option('libunwind')
   libunwind_dep = dependency('libunwind-generic', required: false)
   if libunwind_dep.found()