automake: small cleanup after the meson.build inclusion

Namely extend the EXTRA_DIST list, instead of re-assigning it and bring
back a file dropped by mistake.

Fixes: 436ed65d38d ("autotools: include meson build files in tarball")
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/src/compiler/Makefile.am b/src/compiler/Makefile.am
index 9093fab..fd6811f 100644
--- a/src/compiler/Makefile.am
+++ b/src/compiler/Makefile.am
@@ -64,7 +64,6 @@
 	glsl/meson.build \
 	nir/meson.build \
 	meson.build
-	
 
 MKDIR_GEN = $(AM_V_at)$(MKDIR_P) $(@D)
 PYTHON_GEN = $(AM_V_GEN)$(PYTHON2) $(PYTHON_FLAGS)
diff --git a/src/gallium/drivers/freedreno/Makefile.am b/src/gallium/drivers/freedreno/Makefile.am
index 4e7bf2c..3bcac39 100644
--- a/src/gallium/drivers/freedreno/Makefile.am
+++ b/src/gallium/drivers/freedreno/Makefile.am
@@ -46,4 +46,4 @@
 	$(GALLIUM_COMMON_LIB_DEPS) \
 	$(FREEDRENO_LIBS)
 
-EXTRA_DIST = meson.build
+EXTRA_DIST += meson.build
diff --git a/src/gallium/drivers/i915/Makefile.am b/src/gallium/drivers/i915/Makefile.am
index 6209f66..261f292 100644
--- a/src/gallium/drivers/i915/Makefile.am
+++ b/src/gallium/drivers/i915/Makefile.am
@@ -30,4 +30,4 @@
 
 libi915_la_SOURCES = $(C_SOURCES)
 
-EXTRA_DIST = meson.build
+EXTRA_DIST = TODO meson.build
diff --git a/src/mesa/drivers/dri/i965/Makefile.am b/src/mesa/drivers/dri/i965/Makefile.am
index f1bfe96..79be769 100644
--- a/src/mesa/drivers/dri/i965/Makefile.am
+++ b/src/mesa/drivers/dri/i965/Makefile.am
@@ -105,7 +105,6 @@
 CLEANFILES = $(BUILT_SOURCES)
 
 EXTRA_DIST = \
-	meson.build \
 	brw_oa_hsw.xml \
 	brw_oa_bdw.xml \
 	brw_oa_chv.xml \
@@ -118,7 +117,8 @@
 	brw_oa_glk.xml \
 	brw_oa_cflgt2.xml \
 	brw_oa_cflgt3.xml \
-	brw_oa.py 
+	brw_oa.py \
+	meson.build
 
 # Note: we avoid using a multi target rule here and outputting both the
 # .c and .h files in one go so we don't hit problems with parallel