Revert "Fix absolute paths in clang debug output"

This reverts commit 253cab89. It is no
longer necessary.

Bug: 36463318
Bug: 72408185
Test: compare output directories after `m libc`
Test: compare treehugger output files
Change-Id: Ib5d7bbc13fa6f547e658247559153c61387e3604

parent 6424d17a

cc/config/clang.go

+0 −4

Original line number	Diff line number	Diff line
		@@ -116,10 +116,6 @@ func init() {

		// http://b/68236239 Allow 0/NULL instead of using nullptr everywhere.
		"-Wno-zero-as-null-pointer-constant",

		// http://b/36463318 Clang executes with an absolute path, so clang-provided
		// headers are now absolute.
		"-fdebug-prefix-map=$$PWD/=",
		}, " "))

		pctx.StaticVariable("ClangExtraCppflags", strings.Join([]string{