Drop the deprecated unicore32 target

Target unicore32 was deprecated in commit 8e4ff4a8d2b, v5.2.0.  See
there for rationale.

Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210503084034.3804963-3-armbru@redhat.com>
Acked-by: Thomas Huth <thuth@redhat.com>
diff --git a/fpu/softfloat-specialize.c.inc b/fpu/softfloat-specialize.c.inc
index 9b4cbf4..3f01e1b 100644
--- a/fpu/softfloat-specialize.c.inc
+++ b/fpu/softfloat-specialize.c.inc
@@ -103,7 +103,7 @@
 {
 #if defined(TARGET_MIPS)
     return status->snan_bit_is_one;
-#elif defined(TARGET_HPPA) || defined(TARGET_UNICORE32) || defined(TARGET_SH4)
+#elif defined(TARGET_HPPA) || defined(TARGET_SH4)
     return 1;
 #else
     return 0;
@@ -149,11 +149,10 @@
     sign = 1;
     frac = ~0ULL;
 #else
-    /* This case is true for Alpha, ARM, MIPS, OpenRISC, PPC, RISC-V,
-     * S390, SH4, TriCore, and Xtensa.  I cannot find documentation
-     * for Unicore32; the choice from the original commit is unchanged.
-     * Our other supported targets, CRIS, Nios2, and Tile,
-     * do not have floating-point.
+    /*
+     * This case is true for Alpha, ARM, MIPS, OpenRISC, PPC, RISC-V,
+     * S390, SH4, TriCore, and Xtensa.  Our other supported targets,
+     * CRIS, Nios2, and Tile, do not have floating-point.
      */
     if (snan_bit_is_one(status)) {
         /* set all bits other than msb */