Add missing git ignore

Author: sbrunner

.gitignore

@@ -55,3 +55,9 @@ qgis.kdev4
 qgis.supp
 src/core/qgscontexthelp_texts.cpp
 src/core/qgsexpression_texts.cpp
+tests/testdata/raster/band1_byte_noct_epsg4326.tif.aux.xml
+tests/testdata/raster/band1_float32_noct_epsg4326.tif.aux.xml
+tests/testdata/raster/band1_int16_noct_epsg4326.tif.aux.xml
+tests/testdata/raster/band3_float32_noct_epsg4326.tif.aux.xml
+tests/testdata/raster/band3_int16_noct_epsg4326.tif.aux.xml
+tests/testdata/checker360by180.asc.aux.xml