Use system TBB and remove the embedded code

Set TBB_LIBRARY_FILE environemnt variable to use Intel/OneAPI TBB:
	export TBB_LIBRARY_FILE=$TBBROOT/lib/$TBB_LIB_DIR/libtbb.so

Modified from Debian patch by Andreas Tille <tille@debian.org>:
https://salsa.debian.org/r-pkg-team/r-cran-rcppparallel/-/blob/master/debian/patches/use_debian_packaged_libtbb.patch

Author: hsbadr

R/build.R

@@ -53,13 +53,8 @@ tbbCxxFlags <- function() {
 
 # Return the linker flags requried for TBB on this platform
 tbbLdFlags <- function() {
-   # on Windows and Solaris we need to explicitly link against tbb.dll
-   if ((Sys.info()['sysname'] %in% c("Windows", "SunOS")) && !isSparc()) {
-      tbb <- tbbLibPath()
-      paste("-L", asBuildPath(dirname(tbb)), " -ltbb -ltbbmalloc", sep = "")
-   } else {
-      ""
-   }
+   tbb <- tbbLibPath()
+   paste("-L", asBuildPath(dirname(tbb)), " -ltbb -ltbbmalloc", sep = "")
 }
 
 # Determine the platform-specific path to the TBB library
@@ -71,15 +66,8 @@ tbbLibPath <- function(suffix = "") {
       "Windows" = paste("tbb", suffix, ".dll", sep = ""),
       "SunOS" = paste("libtbb", suffix, ".so", sep = "")
    )
-   if ((sysname %in% names(tbbSupported)) && !isSparc()) {
-      libDir <- "lib/"
-      if (sysname == "Windows")
-         libDir <- paste(libDir, .Platform$r_arch, "/", sep="")
-      system.file(paste(libDir, tbbSupported[[sysname]], sep = ""), 
-                  package = "RcppParallel")
-   } else {
-      NULL
-   }
+
+   Sys.getenv("TBB_LIBRARY_FILE")
 }
 
 isSparc <- function() {