Revert "Fix installheaders target's permissions"

The install of headers excludes the support directory, so these chmod
calls fail on non-existent directories, as seen on this bot:

http://lab.llvm.org:8080/green/job/clang-stage1-configure-RA_build/2801/console

This reverts commit r224300.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224317 91177308-0d34-0410-b5e6-96231b3b80d8

Makefile

@@ -43,20 +43,6 @@ installheaders::
 	chmod 644 $(HEADER_DIR)/c++/v1/ext/*
 	chmod 755 $(HEADER_DIR)/c++/v1/experimental
 	chmod 644 $(HEADER_DIR)/c++/v1/experimental/*
-	chmod 755 $(HEADER_DIR)/c++/v1/support
-	chmod 644 $(HEADER_DIR)/c++/v1/support/*
-	chmod 755 $(HEADER_DIR)/c++/v1/support/android
-	chmod 644 $(HEADER_DIR)/c++/v1/support/android/*
-	chmod 755 $(HEADER_DIR)/c++/v1/support/ibm
-	chmod 644 $(HEADER_DIR)/c++/v1/support/ibm/*
-	chmod 755 $(HEADER_DIR)/c++/v1/support/newlib
-	chmod 644 $(HEADER_DIR)/c++/v1/support/newlib/*
-	chmod 755 $(HEADER_DIR)/c++/v1/support/solaris
-	chmod 644 $(HEADER_DIR)/c++/v1/support/solaris/*
-	chmod 755 $(HEADER_DIR)/c++/v1/support/win32
-	chmod 644 $(HEADER_DIR)/c++/v1/support/win32/*
-	chmod 755 $(HEADER_DIR)/c++/v1/support/xlocale
-	chmod 644 $(HEADER_DIR)/c++/v1/support/xlocale/*
 
 install::