librav1e: Drop need for a dependency on libgit2

rav1e's default features include git_version, which pulls built/git2 and thus
libgit2-sys into build.rs -- a *build-dependency*, so it is probed and linked
for the build host.  cargo_common exports LIBGIT2_NO_VENDOR, so libgit2-sys
probes pkg-config, which points at the target sysroot, and the host link then
picks up the target's libm.so linker script.  That script names absolute
target paths (/usr/lib/libm.so.6), which only resolve on the build host when
host and target architectures differ enough for ld to skip the script as
incompatible, so this breaks on aarch64 hosts building aarch64 targets.
git_version only embeds a git hash in the version string, which is
meaningless here, so drop it and keep the rest of the default feature set.

Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>

meta-multimedia/recipes-multimedia/rav1e/librav1e_p20250902.bb

@@ -7,7 +7,8 @@ inherit cargo_c pkgconfig cargo-update-recipe-crates
 
 require ${PN}-crates.inc
 
-DEPENDS = "libgit2"
+CARGO_BUILD_FLAGS += "--no-default-features --features binaries,asm,threading,signal_support"
+
 DEPENDS:append:x86 = " nasm-native"
 DEPENDS:append:x86-64 = " nasm-native"