Remove unused eclipse projects.

This CL removes:
external/eclipse-basebuilder/
external/eclipse-windowbuilder/
prebuilts/eclipse/
prebuilts/eclipse-build-deps/
Bug: 32116178
Test: None
Merged-In: I0f1edefed63f8e97104f3575ce85c06cada48451
Change-Id: I0f1edefed63f8e97104f3575ce85c06cada48451
(cherry picked from commit 068706dc5863868dd7045e7cafc7e6c5df620926)

default.xml

@@ -129,8 +129,6 @@
   <project path="external/dtc" name="platform/external/dtc" />
   <project path="external/e2fsprogs" name="platform/external/e2fsprogs" groups="pdk" />
   <project path="external/easymock" name="platform/external/easymock" groups="pdk-cw-fs,pdk-fs" />
-  <project path="external/eclipse-basebuilder" name="platform/external/eclipse-basebuilder" groups="pdk-cw-fs,pdk-fs" />
-  <project path="external/eclipse-windowbuilder" name="platform/external/eclipse-windowbuilder" groups="pdk-cw-fs,pdk-fs" />
   <project path="external/eigen" name="platform/external/eigen" groups="pdk" />
   <project path="external/elfutils" name="platform/external/elfutils" groups="pdk" />
   <project path="external/emma" name="platform/external/emma" groups="pdk-cw-fs,pdk-fs" />
@@ -530,8 +528,6 @@
   <project path="prebuilts/clang/host/darwin-x86" name="platform/prebuilts/clang/host/darwin-x86" groups="pdk,darwin" clone-depth="1" />
   <project path="prebuilts/clang/host/linux-x86" name="platform/prebuilts/clang/host/linux-x86" groups="pdk" clone-depth="1" />
   <project path="prebuilts/devtools" name="platform/prebuilts/devtools" groups="pdk-fs" clone-depth="1" />
-  <project path="prebuilts/eclipse" name="platform/prebuilts/eclipse" groups="pdk" clone-depth="1" />
-  <project path="prebuilts/eclipse-build-deps" name="platform/prebuilts/eclipse-build-deps" groups="notdefault,eclipse" clone-depth="1" />
   <project path="prebuilts/gcc/darwin-x86/aarch64/aarch64-linux-android-4.9" name="platform/prebuilts/gcc/darwin-x86/aarch64/aarch64-linux-android-4.9" groups="pdk,darwin,arm" clone-depth="1" />
   <project path="prebuilts/gcc/darwin-x86/arm/arm-linux-androideabi-4.9" name="platform/prebuilts/gcc/darwin-x86/arm/arm-linux-androideabi-4.9" groups="pdk,darwin,arm" clone-depth="1" />
   <project path="prebuilts/gcc/darwin-x86/host/i686-apple-darwin-4.2.1" name="platform/prebuilts/gcc/darwin-x86/host/i686-apple-darwin-4.2.1" groups="pdk,darwin" clone-depth="1" />
@@ -616,7 +612,7 @@
   <project path="tools/idea" name="platform/tools/idea" groups="notdefault,tools" />
   <project path="tools/loganalysis" name="platform/tools/loganalysis" groups="pdk,tradefed" />
   <project path="tools/motodev" name="platform/tools/motodev" groups="notdefault,motodev" />
-  <project path="tools/repohooks" name="platform/tools/repohooks" groups="adt-infra,cts,eclipse,motodev,pdk,tools,tradefed" />
+  <project path="tools/repohooks" name="platform/tools/repohooks" groups="adt-infra,cts,motodev,pdk,tools,tradefed" />
   <project path="tools/studio/cloud" name="platform/tools/studio/cloud" groups="notdefault,tools" />
   <project path="tools/swt" name="platform/tools/swt" groups="notdefault,tools" />
   <project path="tools/test/connectivity" name="platform/tools/test/connectivity" />