ispc: isolate LLVM superbuild from recipe-sysroot-nativeHEADmaster

The ISPC superbuild internally builds LLVM (stage1/stage2). The
generated toolchain files inherit Yocto flags and sysroot paths,
causing CMake to locate libraries from recipe-sysroot-native.

This leads to linking failures when host compiler toolchains are
used together with libraries built against a newer glibc, resulting
in errors such as:

  undefined reference to `__isoc23_wcstol@GLIBC_2.38'

Fix this by isolating the LLVM superbuild from Yocto sysroot:

* Patch generated stage1/stage2 toolchain files:
  - Replace symbolic compiler names (cc/c++) with ${BUILD_CC}/${BUILD_CXX}
  - Clear injected CMake compiler and linker flags
* Prevent CMake from searching recipe-sysroot-native:
  - Set CMAKE_FIND_ROOT_PATH_MODE_* to NEVER
* Disable optional LLVM features requiring external libraries
  (libedit, terminfo, zstd, zlib)
* Scope environment cleanup to the cmake build invocation to avoid
  leaking Yocto flags into the superbuild

This ensures the internal LLVM build uses a consistent host
environment, avoiding GLIBC ABI mismatches.

Remove ncurses dependency as terminfo/libedit are disabled.

Signed-off-by: Yogesh Tyagi <yogesh.tyagi@intel.com>

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