[runtimes] Remove pstl from the list of supported runtimes

The pstl top-level directory was removed, but we forgot to remove
pstl from the list of valid subdirectories.

Author: ldionne

runtimes/CMakeLists.txt

@@ -35,7 +35,7 @@ list(INSERT CMAKE_MODULE_PATH 0
 
 # We order libraries to mirror roughly how they are layered, except that compiler-rt can depend
 # on libc++, so we put it after.
-set(LLVM_DEFAULT_RUNTIMES "libc;libunwind;libcxxabi;pstl;libcxx;compiler-rt;libclc;openmp;offload")
+set(LLVM_DEFAULT_RUNTIMES "libc;libunwind;libcxxabi;libcxx;compiler-rt;libclc;openmp;offload")
 set(LLVM_SUPPORTED_RUNTIMES "${LLVM_DEFAULT_RUNTIMES};llvm-libgcc;flang-rt;libsycl;orc-rt")
 set(LLVM_ENABLE_RUNTIMES "" CACHE STRING
   "Semicolon-separated list of runtimes to build, or \"all\" (${LLVM_DEFAULT_RUNTIMES}). Supported runtimes are ${LLVM_SUPPORTED_RUNTIMES}.")