[rpms/usd] rawhide: No longer explicitly demand the ninja backend for CMake

[Benjamin A. Beasley <code@musicinmybrain.net>]

            A new commit has been pushed.

            Repo   : rpms/usd
            Branch : rawhide
            Commit : 1776c7c801056927547d3ee64a7313b5ed6e7e76
            Author : Benjamin A. Beasley <code@musicinmybrain.net>
            Date   : 2026-09-19T07:32:38+01:00
            Stats  : +0/-10 in 1 file(s)
            URL    : https://src.fedoraproject.org/rpms/usd/c/1776c7c801056927547d3ee64a7313b5ed6e7e76?branch=rawhide

            Log:
            No longer explicitly demand the ninja backend for CMake

It’s now the default in Fedora.

[skip changelog]

---
diff --git a/usd.spec b/usd.spec
index 85a52b2..a46123c 100644
--- a/usd.spec
+++ b/usd.spec
@@ -9,10 +9,6 @@
 %bcond embree        1
 %bcond jemalloc      0
 %bcond materialx     1
-# Default "UNIX Makefiles" backend for CMake would also work fine; ninja is a
-# bit faster. We conditionalize it just in case there are backend-specific
-# issues in the future.
-%bcond ninja         1
 %bcond openshading   1
 %bcond openvdb       1
 %bcond ocio          1
@@ -164,9 +160,6 @@ Patch:          0001-Replace-PyWeakref_GetObject-with-PyWeakref_GetRef.patch
 BuildRequires:  gcc-c++
 
 BuildRequires:  cmake
-%if %{with ninja}
-BuildRequires:  ninja-build
-%endif
 
 BuildRequires:  dos2unix
 BuildRequires:  help2man
@@ -599,9 +592,6 @@ extra_flags="${extra_flags-} $(pkgconf --cflags Imath)"
 extra_flags="${extra_flags-} -DTBB_SUPPRESS_DEPRECATED_MESSAGES=1"
 
 %cmake \
-%if %{with ninja}
-    -GNinja \
-%endif
 %if %{with jemalloc}
     -DPXR_MALLOC_LIBRARY="%{_libdir}/libjemalloc.so" \
 %endif