[ROCm] Custom OpenBLAS library name (#2750)

- TheRock build system for ROCm builds OpenBLAS from source and uses a
custom name for the library.
- Following existing conventions in FindOpenBLAS.cmake to support
finding a custom named version of OpenBLAS.

Author: jayhawk-commits

cmake/Modules/FindOpenBLAS.cmake

@@ -29,10 +29,15 @@ SET(Open_BLAS_LIB_SEARCH_PATHS
         $ENV{OpenBLAS}/lib
         $ENV{OpenBLAS_HOME}
         $ENV{OpenBLAS_HOME}/lib
- )
+)
+
+SET(Open_BLAS_LIB_NAME openblas)
+IF(DEFINED ENV{OpenBLAS_LIB_NAME})
+  SET(Open_BLAS_LIB_NAME $ENV{OpenBLAS_LIB_NAME})
+ENDIF()
 
 FIND_PATH(OpenBLAS_INCLUDE_DIR NAMES cblas.h PATHS ${Open_BLAS_INCLUDE_SEARCH_PATHS})
-FIND_LIBRARY(OpenBLAS_LIB NAMES openblas PATHS ${Open_BLAS_LIB_SEARCH_PATHS})
+FIND_LIBRARY(OpenBLAS_LIB NAMES ${Open_BLAS_LIB_NAME} PATHS ${Open_BLAS_LIB_SEARCH_PATHS})
 
 SET(OpenBLAS_FOUND ON)