Fix missing SIP_VERSION preprocessor macro

nyalldawson · nyalldawson · commit 28df1b465176 · 2019-03-01T05:45:12.000+10:00
Was breaking all #if SIP_VERSION checks - most importantly
preventing exitPython() from being called correctly on QGIS
exit.
diff --git a/cmake/FindSIP.cmake b/cmake/FindSIP.cmake
@@ -56,3 +56,5 @@ ELSE(SIP_VERSION)
   ENDIF(SIP_FOUND)
 
 ENDIF(SIP_VERSION)
+
+ADD_DEFINITIONS(-DSIP_VERSION=0x${SIP_VERSION})
