desktop, plug-ins, tools: update various .gitignore.

desktop/.gitignore

@@ -6,4 +6,5 @@
 /gimp.desktop
 /gimp-data-extras.metainfo.xml.in
 /gimp-data-extras.metainfo.xml
+/test-appdata.sh
 /.thumbnails

plug-ins/goat-exercises/.gitignore

@@ -0,0 +1,6 @@
+/.deps
+/.libs
+/Makefile
+/Makefile.in
+/goat-exercise
+/goat-exercise.exe

tools/.gitignore

@@ -4,8 +4,9 @@
 /.libs
 /kernelgen
 /gimptool-2.99
-/gimptool-2.00.exe
+/gimptool-2.99.exe
 /gimp-test-clipboard-2.99
 /gimp-test-clipboard-2.99.exe
+/gimp-debug-resume.exe
 /compute-svg-viewbox
 /compute-svg-viewbox.exe