0ad: remove unused mozjs78-devel makedepend

Uses its own vendored `mozjs78`.

there are some issues reported with modern mozjs on python 3.12, and
with the ancient vendored mozjs this also FTBFS. Hopefully a patch
appears at some point.
https://bugzilla.mozilla.org/show_bug.cgi?id=1857492
https://bugzilla.mozilla.org/show_bug.cgi?id=1857515

srcpkgs/0ad/template

@@ -6,7 +6,7 @@ archs="x86_64* i686* aarch64* armv7l* ppc64le*"
 hostmakedepends="pkg-config perl cmake python3 rust cargo yasm tar clang"
 makedepends="SDL2-devel boost-devel gloox-devel libcurl-devel libenet-devel
  libopenal-devel libpng-devel libsodium-devel libxml2-devel miniupnpc-devel
- nspr-devel wxWidgets-gtk3-devel fmt-devel mozjs78-devel freetype-devel"
+ nspr-devel wxWidgets-gtk3-devel fmt-devel freetype-devel"
 depends="${pkgname}-data"
 short_desc="Historically-based real-time strategy game"
 maintainer="Helmut Pozimski <helmut@pozimski.eu>"