gtlshttp.c: Correct libsoup DLL names for Visual Studio
gtlshttp.c: Correct libsoup DLL names for Visual Studio

The Meson builds of libsoup under Visual Studio-like compilers give us
soup-3.0-0.dll and soup-2.4-1.dll for libsoup-3.x and libsoup-2.x
respectively, so make sure we look for the right DLL names.

GNOME/glib-networking,GNOME/glib-networking,GNOME/glib-networking