openimageio: don't manually set CMAKE_SYSTEM_PROCESSOR

[ci skip]

srcpkgs/openimageio/template

@@ -5,8 +5,7 @@ revision=3
 wrksrc="oiio-Release-${version}"
 build_style=cmake
 configure_args="-DUSE_OPENGL=0 -DUSE_QT=0 -DUSE_PYTHON=0 -DOIIO_BUILD_TESTS=0
- -DSTOP_ON_WARNING=0 -DCMAKE_SYSTEM_PROCESSOR=${XBPS_TARGET_MACHINE}
- -DUSE_STD_REGEX_EXITCODE=0"
+ -DSTOP_ON_WARNING=0 -DUSE_STD_REGEX_EXITCODE=0"
 hostmakedepends="pkg-config"
 makedepends="boost-devel giflib-devel libraw-devel libopenjpeg-devel libwebp-devel
  libjpeg-turbo-devel tiff-devel libpng-devel libopenexr-devel freetype-devel