[gegl] build: force disting of perf folder to pass dist-check

[Øyvind Kolås <ok src gnome org>]

commit 0bd014d680d90cad16dbd039f9feceb03ccea8ec
Author: Øyvind Kolås <pippin gimp org>
Date:   Mon Mar 19 21:32:41 2018 +0100

    build: force disting of perf folder to pass dist-check

 Makefile.am |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 302ac84..b48bf02 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -21,6 +21,13 @@ if ENABLE_DOCS
 SUBDIRS+= docs
 endif
 
+# hack to make perf folder be included in dist, it doesn't harm to include perf in tests
+# for people that enable workshop, and as a side effect it gets disted.
+
+if ENABLE_WORKSHOP  
+SUBDIRS+= perf
+endif
+
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = gegl-$(GEGL_API_VERSION).pc