Add support files required for building on Solaris.

llvm-svn: 151721
diff --git a/libcxx/include/support/solaris/floatingpoint.h b/libcxx/include/support/solaris/floatingpoint.h
new file mode 100644
index 0000000..21b0349
--- /dev/null
+++ b/libcxx/include/support/solaris/floatingpoint.h
@@ -0,0 +1,5 @@
+#define atof sun_atof
+#define strtod sun_strtod
+#include_next "floatingpoint.h"
+#undef atof
+#undef strtod