Remove unused host Linux gcc project.

default.xml

@@ -427,7 +427,6 @@
   <project path="prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9" name="platform/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9" groups="pdk,linux,arm" />
   <project path="prebuilts/gcc/linux-x86/arm/arm-eabi-4.8" name="platform/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8" groups="pdk,linux,arm" />
   <project path="prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.8" name="platform/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.8" groups="pdk,linux,arm" />
-  <project path="prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6" name="platform/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6" groups="pdk,linux" />
   <project path="prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.8" name="platform/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.8" groups="pdk,linux" />
   <project path="prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8" name="platform/prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8" />
   <project path="prebuilts/gcc/linux-x86/mips/mips64el-linux-android-4.9" name="platform/prebuilts/gcc/linux-x86/mips/mips64el-linux-android-4.9" />