meson: use explicit_bzero if it is available (#376)

AC_CHECK_FUNCS([explicit_bzero]) was not ported during the switch from autotools to meson.

Fixes: ea1cb44
Related: 9f675b8

Author: julio-b

meson.build

@@ -45,6 +45,7 @@ endif
 
 cdata.set('HAVE_STRNDUP', cc.has_function('strndup'))
 cdata.set('HAVE_MKDIRP', cc.has_function('mkdirp'))
+cdata.set('HAVE_EXPLICIT_BZERO', cc.has_function('explicit_bzero'))
 
 # Instead of generating config.h directly, make vcs_tag generate it so that
 # @VCS_TAG@ is replaced.