Drop explicit requires on ffmpeg-free-devel (rhbz#2464712)

Signed-off-by: Cristian Le <git@lecris.dev>

vtk-CVE-2025-34297.patch

@@ -0,0 +1,23 @@
+diff -up VTK-9.6.0/ThirdParty/kissfft/vtkkissfft/kiss_fft.c.CVE-2025-34297 VTK-9.6.0/ThirdParty/kissfft/vtkkissfft/kiss_fft.c
+--- VTK-9.6.0/ThirdParty/kissfft/vtkkissfft/kiss_fft.c.CVE-2025-34297	2026-02-10 20:19:44.000000000 -0700
++++ VTK-9.6.0/ThirdParty/kissfft/vtkkissfft/kiss_fft.c	2026-03-16 19:49:43.257246266 -0600
+@@ -6,7 +6,7 @@
+  *  See COPYING file for more information.
+  */
+ 
+-
++#include <stdint.h>
+ #include "_kiss_fft_guts.h"
+ /* The guts header contains all the multiplication and addition macros that are defined for
+  fixed or floating point complex numbers.  It also delares the kf_ internal functions.
+@@ -333,6 +333,10 @@ void kf_factor(int n,int * facbuf)
+ kiss_fft_cfg kiss_fft_alloc(int nfft,int inverse_fft,void * mem,size_t * lenmem )
+ {
+     kiss_fft_cfg st=NULL;
++    // check for overflow condition {memneeded > SIZE_MAX}.
++    if (nfft >= (SIZE_MAX - 2*sizeof(struct kiss_fft_state))/sizeof(kiss_fft_cpx))
++        return NULL;
++
+     size_t memneeded = sizeof(struct kiss_fft_state)
+         + sizeof(kiss_fft_cpx)*(nfft-1); /* twiddle factors*/
+ 

vtk.spec

@@ -1,5 +1,3 @@
-%undefine __cmake_in_source_build
-
 # State Nov 11 2020, LTO causes
 # TestXMLHyperTreeGridIO.cxx.o (symbol from plugin): undefined reference to symbol
 # '_ZZNSt8__detail18__to_chars_10_implIjEEvPcjT_E8__digits@@LLVM_11'
@@ -80,13 +78,15 @@ Patch: vtk-tk9.patch
 # https://gitlab.kitware.com/vtk/vtk/-/issues/19622
 # https://bugzilla.redhat.com/show_bug.cgi?id=2386242
 Patch: vtk-ppc64-no-always-inline.patch
+# Fix Integer Overflow on 32-bit in KissFFT
+Patch: vtk-CVE-2025-34297.patch
 
 URL: https://vtk.org/
 
 BuildRequires:  cmake
 # Allow for testing with different cmake generators.
 # make still seems to be faster than ninja, but has failed at times.
-%global cmake_gen %{nil}
+%global _cmake_generator "Unix Makefiles"
 BuildRequires:  gcc-c++
 %if %{with java}
 BuildRequires: java-devel
@@ -108,7 +108,6 @@ BuildRequires:  double-conversion-devel
 BuildRequires:  eigen3-devel
 BuildRequires:  expat-devel
 BuildRequires:  fast_float-devel
-BuildRequires:  ffmpeg-free-devel
 %if %{with fmt}
 BuildRequires:  fmt-devel >= 8.1.0
 %endif
@@ -207,7 +206,6 @@ Requires: eigen3-static \
 Requires: expat-devel%{?_isa} \
 # fast_float is noarch and header-only \
 Requires: fast_float-devel \
-Requires: ffmpeg-free-devel%{?_isa} \
 %if %{with fmt} \
 Requires: fmt-devel%{?_isa} \
 %endif \
@@ -706,7 +704,7 @@ export JAVA_TOOL_OPTIONS=-Xmx2048m
 %endif
 
 
-%cmake %{cmake_gen} \
+%cmake \
  %{vtk_cmake_options} \
  -DVTK_BUILD_DOCUMENTATION:BOOL=ON \
  -DVTK_BUILD_EXAMPLES:BOOL=ON \
@@ -722,7 +720,7 @@ do
   module load mpi/$mpi-%{_arch}
   # CMAKE_INSTALL_LIBDIR -> ARCHIVE_DESTINATION must not be an absolute path
   # VTK_MODULE_ENABLE_VTK_FiltersParallelStatistics need MPI modules at the moment
-  %cmake %{cmake_gen} \
+  %cmake \
    %{vtk_cmake_options} \
    -DCMAKE_PREFIX_PATH:PATH=$MPI_HOME \
    -DCMAKE_INSTALL_PREFIX:PATH=$MPI_HOME \