Corrected macro name (bug 539612)

Change-Id: Ibfa87fa49d16b4e2bc39d7676b5bb70bcc1d1c59
Signed-off-by: Botond Baranyi <botond.baranyi@ericsson.com>

common/ttcn3float.hh

@@ -23,7 +23,7 @@
    are displayed in exponential notation. */
 #define MAX_DECIMAL_FLOAT		1.0E+10
 
-#if __clpusplus < 201103L // signbit is a function in C++11, not a macro
+#if __cplusplus < 201103L // signbit is a function in C++11, not a macro
 
 #ifndef signbit
 // Probably Solaris.