[Bug 248736] devel/json-glib: Fix build with clang 11

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248736

Dimitry Andric <dim at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|devel/json-glib: Fix build  |devel/json-glib: Fix build
                   |with -fno-common (clang 11  |with clang 11
                   |and gcc 10)                 |

--- Comment #1 from Dimitry Andric <dim at FreeBSD.org> ---
Sorry, the summary and description were not correct. In case of json-glib, it
was a new clang 11 -Werror warning:

../json-glib/json-scanner.c:928:13: error: cast to smaller integer type
'GTokenType' from 'gpointer' (aka 'void *')
[-Werror,-Wvoid-pointer-to-enum-cast]
        *token_p = (GTokenType) value_p->v_symbol;
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This is because v_symbol is a pointer and GTokenType is an enum (so int-like).
Glib provides the GPOINTER_TO_INT macro for this purpose.

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