Evas filters: Fix make doc, check when EFL is not installed

Thanks @aerodynamik for even giving the proper environment
variable to set :)

Fixes T2614

doc/previews/Makefile.am

@@ -55,7 +55,7 @@ previews-data: preview_text_filter
 		if [ -e ${top_srcdir}/doc/previews/filter_$${a}.sh ] ; then \
 			source ${top_srcdir}/doc/previews/filter_$${a}.sh ; \
 		fi ; \
-		$(top_builddir)/doc/previews/preview_text_filter "$${TEXT}" "$${FILTER}" "$(DATADIR)/filter_$${a}.png" "$${FONT}" "$${SIZE}" ; \
+		EVAS_DATA_DIR="$(top_srcdir)/src/lib/evas" $(top_builddir)/doc/previews/preview_text_filter "$${TEXT}" "$${FILTER}" "$(DATADIR)/filter_$${a}.png" "$${FONT}" "$${SIZE}" ; \
 		cp "$(DATADIR)/filter_$${a}.png" "$(HTMLDIR)/" ; \
 	done
 

src/Makefile_Edje.am

@@ -278,6 +278,7 @@ tests/edje/edje_suite.h
 
 tests_edje_edje_suite_CPPFLAGS = -I$(top_builddir)/src/lib/efl \
 $(EDJE_COMMON_CPPFLAGS) \
+-DTESTS_SRC_DIR=\"$(top_srcdir)/src/tests/edje\" \
 -DTESTS_BUILD_DIR=\"$(top_builddir)/src/tests/edje\" \
 @CHECK_CFLAGS@
 tests_edje_edje_suite_LDADD = @CHECK_LIBS@  $(USE_EDJE_BIN_LIBS)

src/tests/edje/edje_test_edje.c

@@ -13,6 +13,8 @@
 #include "edje_suite.h"
 #include "edje_tests_helpers.h"
 
+#define EVAS_DATA_DIR TESTS_SRC_DIR "/../../lib/evas"
+
 START_TEST(edje_test_edje_init)
 {
    int ret;
@@ -213,6 +215,8 @@ START_TEST(edje_test_filters)
    const char *prg, *name;
    Eina_Bool b;
 
+   setenv("EVAS_DATA_DIR", EVAS_DATA_DIR, 1);
+
    obj = edje_object_add(evas);
    fail_unless(edje_object_file_set(obj, test_layout_get("test_filters.edj"), "test_group"));
 

src/tests/evas/evas_test_filters.c

@@ -17,10 +17,12 @@
 
 #define TEST_FONT_NAME "DejaVuSans,UnDotum"
 #define TEST_FONT_SOURCE TESTS_SRC_DIR "/TestFont.eet"
+#define EVAS_DATA_DIR TESTS_SRC_DIR "/../../lib/evas"
 
 #define START_FILTER_TEST() \
    Ecore_Evas *ee; Evas *evas; \
    Evas_Object *to; \
+   setenv("EVAS_DATA_DIR", EVAS_DATA_DIR, 1); \
    evas_init(); \
    ecore_evas_init(); \
    ee = ecore_evas_buffer_new(1, 1); \
@@ -67,6 +69,8 @@ START_TEST(evas_filter_parser)
    // itself is full featured. Let's just ensure that our main functions exist
    // and that calling them (kinda) works.
 
+   setenv("EVAS_DATA_DIR", EVAS_DATA_DIR, 1);
+
 #define CHECK_FILTER(_a, _v) do { \
    pgm = evas_filter_program_new("evas_suite", EINA_TRUE); \
    if (evas_filter_program_parse(pgm, _a) != _v) \