[PHP7] Wrap bool constants as PHP booleans

Leave PHP5 wrapping them as integers as this change could cause
incompatibilities.

Fixes issue https://github.com/swig/swig/issues/686 noted by Nishant
Gupta.

Lib/php/const.i

@@ -12,10 +12,12 @@
                    unsigned long,
                    unsigned char,
                    signed char,
-                   bool,
                    enum SWIGTYPE
   "SWIG_LONG_CONSTANT($symname, ($1_type)$value);";
 
+%typemap(consttab) bool
+  "SWIG_BOOL_CONSTANT($symname, ($1_type)$value);";
+
 %typemap(consttab) float,
                    double
   "SWIG_DOUBLE_CONSTANT($symname, $value);";