OpenEXR: Add powerpc64 patch

Author: eschnett

O/OpenEXR/build_tarballs.jl

@@ -19,6 +19,8 @@ cd $WORKSPACE/srcdir/openexr*
 
 # We are building with old kernel headers that do not define `HWCAP_SVE2`
 atomic_patch -p1 $WORKSPACE/srcdir/patches/sve2.patch
+# We are building with an old glibc that does not define `AT_HWCAP2`
+atomic_patch -p1 $WORKSPACE/srcdir/patches/hwcap2.patch
 
 cmake -B build -G Ninja \
     -DBUILD_TESTING=OFF \

O/OpenEXR/bundled/patches/hwcap2.patch

@@ -0,0 +1,16 @@
+diff --git a/external/OpenJPH/src/core/others/ojph_arch.cpp b/external/OpenJPH/src/core/others/ojph_arch.cpp
+index 018e461c..2d0b8e0a 100644
+--- a/external/OpenJPH/src/core/others/ojph_arch.cpp
++++ b/external/OpenJPH/src/core/others/ojph_arch.cpp
+@@ -240,6 +240,11 @@ namespace ojph {
+       #include <sys/auxv.h>
+       #include <asm/cputable.h>
+ 
++      // Compatibility for older glibc versions that do not define `AT_HWCAP2`
++      #ifndef AT_HWCAP2
++      #  define AT_HWCAP2 26
++      #endif
++
+       bool init_cpu_ext_level(int& level) {
+         unsigned long hwcap = getauxval(AT_HWCAP);
+         unsigned long hwcap2 = getauxval(AT_HWCAP2);