Problem: ZMQ-style compact streq() replaced by strcmp()==0 monstrosity

Solution: Restore the pre-Feb2018 coding pattern (ease regeneration of less dynamic projects) and retain the benefits of that patch (do not require builds with czmq headers).

Signed-off-by: Jim Klimov <EvgenyKlimov@eaton.com>

Author: jimklimov

zproject_class.gsl

@@ -215,6 +215,17 @@ $(project.GENERATED_WARNING_HEADER:)
 
 #include "$(project.prefix)_classes.$(project.header_ext)"
 
+#ifndef streq
+/*
+ *  Allow projects without czmq dependency:
+ *  The generated code expects that czmq pulls in a few headers and macro
+ *  definitions. This is a minimal fix for the generated selftest file in
+ *  C++ mode.
+ */
+#include <string.h>
+#define streq(s1,s2)    (!strcmp ((s1), (s2)))
+#endif
+
 typedef struct {
     const char *testname;           // test name, can be called from command line this way
     void (*test) (bool);            // function to run the test (or NULL for private tests)