Revert "Build clang and other llvm executables as PIE"

This reverts commit 470f9f13de.

I need more time to figure out how to make this work correctly with
incremental builds, which it currently miserably fails on.

lib/clang/Makefile.inc

@@ -2,11 +2,7 @@
 .include <bsd.compiler.mk>
 
 PACKAGE=	clang
-
-# Build only PIE static libraries; bsd.lib.mk does support this directly.
-MK_PIE:=	no
-CFLAGS+=	${PIEFLAG} ${SHARED_CFLAGS}
-CXXFLAGS+=	${PIEFLAG} ${SHARED_CXXFLAGS}
+MK_PIE:=	no	# Explicit libXXX.a references
 
 .if ${COMPILER_TYPE} == "clang"
 DEBUG_FILES_CFLAGS= -gline-tables-only

usr.bin/clang/Makefile.inc

@@ -3,6 +3,8 @@ WARNS?=		0
 
 .include <bsd.compiler.mk>
 
+MK_PIE:=	no	# Explicit libXXX.a references
+
 .if ${COMPILER_TYPE} == "clang"
 DEBUG_FILES_CFLAGS= -gline-tables-only
 .else