Update localplt.data for powerpc-nofpu.

Testing for powerpc-nofpu showed that localplt.data was out of date.
Two new soft-fp functions showed up in the list: __gtsf2 and
__unordsf2; this patch adds these as optional.  __signbit and
__signbitl no longer appear as local PLT entries; given the move to
__builtin_signbit* for all GCC versions supported for building glibc
(and given the use of the type-generic signbit macro within glibc),
those can safely be removed from the list, which this patch does.

Tested for powerpc-nofpu.

	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data
	(__gtsf2): Add as optional for libc.so.
	(__unordsf2): Likewise.
	(__signbit): Remove for libc.so.
	(__signbitl): Likewise.

ChangeLog

@@ -1,3 +1,11 @@
+2016-01-20  Joseph Myers  <joseph@codesourcery.com>
+
+	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data
+	(__gtsf2): Add as optional for libc.so.
+	(__unordsf2): Likewise.
+	(__signbit): Remove for libc.so.
+	(__signbitl): Likewise.
+
 2016-01-19  Stefan Liebler  <stli@linux.vnet.ibm.com>
 
 	* iconvdata/bug-iconv11.c (test_ibm93x):

sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data

@@ -15,17 +15,17 @@ libc.so: __floatunsidf ?
 libc.so: __floatunsisf ?
 libc.so: __gedf2 ?
 libc.so: __gtdf2 ?
+libc.so: __gtsf2 ?
 libc.so: __ledf2 ?
 libc.so: __ltdf2 ?
 libc.so: __muldf3 ?
 libc.so: __mulsf3 ?
 libc.so: __nedf2 ?
-libc.so: __signbit
-libc.so: __signbitl
 libc.so: __subdf3 ?
 libc.so: __subsf3 ?
 libc.so: __truncdfsf2 ?
 libc.so: __unorddf2 ?
+libc.so: __unordsf2 ?
 libc.so: abort ?
 libc.so: calloc
 libc.so: free