Automatically build with debug symbols when building with WITH_CTF.

Otherwise there's nothing for ctfconvert to do, and it ends up emitting an
error for each object file. Also remove some redundant checks from
bsd.prog.mk and bsd.lib.mk.

Differential Revision:	https://reviews.freebsd.org/D1111
Reviewed by:		imp

share/mk/bsd.lib.mk

@@ -36,7 +36,7 @@ NO_WERROR=
 .if defined(DEBUG_FLAGS)
 CFLAGS+= ${DEBUG_FLAGS}
 
-.if ${MK_CTF} != "no" && ${DEBUG_FLAGS:M-g} != ""
+.if ${MK_CTF} != "no"
 CTFFLAGS+= -g
 .endif
 .else

share/mk/bsd.own.mk

@@ -128,6 +128,7 @@ __<bsd.own.mk>__:
 
 .if ${MK_CTF} != "no"
 CTFCONVERT_CMD=	${CTFCONVERT} ${CTFFLAGS} ${.TARGET}
+DEBUG_FLAGS+=	-g
 .elif defined(.PARSEDIR) || (defined(MAKE_VERSION) && ${MAKE_VERSION} >= 5201111300)
 CTFCONVERT_CMD=
 .else

share/mk/bsd.prog.mk

@@ -20,7 +20,7 @@ NO_WERROR=
 CFLAGS+=${DEBUG_FLAGS}
 CXXFLAGS+=${DEBUG_FLAGS}
 
-.if ${MK_CTF} != "no" && ${DEBUG_FLAGS:M-g} != ""
+.if ${MK_CTF} != "no"
 CTFFLAGS+= -g
 .endif
 .endif