boost: fix compilation error under SPARC

Missing braces.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/boost/patches/030-sparc.patch

@@ -0,0 +1,15 @@
+--- a/boost/predef/architecture/sparc.h
++++ b/boost/predef/architecture/sparc.h
+@@ -34,10 +34,10 @@ http://en.wikipedia.org/wiki/SPARC[SPARC
+ 
+ #if defined(__sparc__) || defined(__sparc)
+ #   undef BOOST_ARCH_SPARC
+-#   if !defined(BOOST_ARCH_SPARC) && (defined(__sparcv9) || defined(__sparc_v9__)
++#   if !defined(BOOST_ARCH_SPARC) && (defined(__sparcv9) || defined(__sparc_v9__))
+ #       define BOOST_ARCH_SPARC BOOST_VERSION_NUMBER(9,0,0)
+ #   endif
+-#   if !defined(BOOST_ARCH_SPARC) && (defined(__sparcv8) || defined(__sparc_v8__)
++#   if !defined(BOOST_ARCH_SPARC) && (defined(__sparcv8) || defined(__sparc_v8__))
+ #       define BOOST_ARCH_SPARC BOOST_VERSION_NUMBER(8,0,0)
+ #   endif
+ #   if !defined(BOOST_ARCH_SPARC)