Revert "don't forward ia32 to TBB under solaris sparc"

This reverts commit a0cf438.

Author: jjallaire

src/Makevars

@@ -47,14 +47,10 @@ ifeq ($(USE_TBB),  Windows)
 
 endif
 
-# For Solaris detect if this is 32-bit R on x86 and if so forward that to TBB
 ifeq ($(USE_TBB),  SunOS)
-   SUNOS_ARCH = $(shell uname -p)
-   ifneq ($(SUNOS_ARCH),  sparc)
-      R_32BIT = $(shell ${R_HOME}/bin/Rscript -e 'cat(.Machine$$sizeof.pointer == 4)')
-      ifeq ($(R_32BIT), TRUE)
-         MAKE_ARGS += arch=ia32
-      endif
+   R_32BIT = $(shell ${R_HOME}/bin/Rscript -e 'cat(.Machine$$sizeof.pointer == 4)')
+   ifeq ($(R_32BIT), TRUE)
+      MAKE_ARGS += arch=ia32
    endif
 endif