[gnome-shell] Define ST_COMPILATION in the St enumeration template

[Emmanuele Bassi <ebassi src gnome org>]

commit b0d21c3a37df21bf048c1d5f6af5fc6af976a1af
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Aug 10 23:27:56 2017 +0100

    Define ST_COMPILATION in the St enumeration template
    
    In parallel builds we may end up with st-enum-types.c being built inside
    separate targets outside of src/st which may not have the ST_COMPILATION
    pre-processor symbol defined. For this reason, we need to define it
    ourselves in the source file, before including other headers, to avoid
    the single-include guard.

 src/st/st-enum-types.c.in |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/st/st-enum-types.c.in b/src/st/st-enum-types.c.in
index 738ac27..bf0c544 100644
--- a/src/st/st-enum-types.c.in
+++ b/src/st/st-enum-types.c.in
@@ -1,4 +1,7 @@
 /*** BEGIN file-header ***/
+#ifndef ST_COMPILATION
+#define ST_COMPILATION
+#endif
 #include "st-enum-types.h"
 /*** END file-header ***/