Revert "[libomptarget][cuda] Gracefully handle missing cuda library"

This reverts commit fafd45c.

Author: JonChesterfield

openmp/libomptarget/plugins/cuda/dynamic_cuda/cuda.cpp

@@ -93,7 +93,7 @@ CUresult cuInit(unsigned X) {
   // Note: Called exactly once from cuda rtl.cpp in a global constructor so
   // does not need to handle being called repeatedly or concurrently
   if (!checkForCUDA()) {
-    return CUDA_ERROR_INVALID_HANDLE;
+    return CUDA_ERROR_INVALID_VALUE;
   }
   return dlwrap_cuInit(X);
 }

openmp/libomptarget/plugins/cuda/dynamic_cuda/cuda.h

@@ -26,7 +26,6 @@ typedef struct CUstream_st *CUstream;
 typedef enum cudaError_enum {
   CUDA_SUCCESS = 0,
   CUDA_ERROR_INVALID_VALUE = 1,
-  CUDA_ERROR_INVALID_HANDLE = 400,
 } CUresult;
 
 typedef enum CUstream_flags_enum {

openmp/libomptarget/plugins/cuda/src/rtl.cpp

@@ -401,11 +401,6 @@ class DeviceRTLTy {
     DP("Start initializing CUDA\n");
 
     CUresult Err = cuInit(0);
-    if (Err == CUDA_ERROR_INVALID_HANDLE) {
-      // Can't call cuGetErrorString if dlsym failed
-      DP("Failed to load CUDA shared library\n");
-      return;
-    }
     if (!checkResult(Err, "Error returned from cuInit\n")) {
       return;
     }