detect i386 rather than sparc (as at least we can test that)

Author: jjallaire

src/Makevars

@@ -50,7 +50,7 @@ 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)
+   ifeq ($(SUNOS_ARCH), i386)
       R_32BIT = $(shell ${R_HOME}/bin/Rscript -e 'cat(.Machine$$sizeof.pointer == 4)')
       ifeq ($(R_32BIT), TRUE)
          MAKE_ARGS += arch=ia32