unit: avoid re-definition of enum for older gcc versions

<koen> | ./src/shared/unit-name.h:29:23: error: redefinition of typedef 'UnitType'
<koen> | ./src/core/unit.h:30:23: note: previous declaration of 'UnitType' was here

1 files changed, 0 insertions, 1 deletions

diff --git a/src/core/unit.h b/src/core/unit.h
index 9d75e02532..61a85d7bee 100644
--- a/src/core/unit.h
+++ b/src/core/unit.h
@@ -27,7 +27,6 @@
 
 typedef struct Unit Unit;
 typedef struct UnitVTable UnitVTable;
-typedef enum UnitType UnitType;
 typedef enum UnitActiveState UnitActiveState;
 typedef enum UnitDependency UnitDependency;
 typedef struct UnitRef UnitRef;