Make sure libgcc_s is finished building in _startup_libs before

building libcxxrt with high -j levels.  The workaround in
libc++/Makefile isn't necessary once that race is solved.

Reviewed by:	theravin

Makefile.inc1

@@ -1243,6 +1243,9 @@ _startup_libs+=	lib/libcxxrt
 .endif
 
 gnu/lib/libgcc__L: lib/libc__L
+.if ${MK_LIBCPLUSPLUS} != "no"
+lib/libcxxrt__L: gnu/lib/libgcc__L
+.endif
 
 _prebuild_libs=	${_kerberos5_lib_libasn1} ${_kerberos5_lib_libhdb} \
 		${_kerberos5_lib_libheimntlm} \

lib/libc++/Makefile

@@ -39,7 +39,7 @@ WARNS=          0
 CXXFLAGS+=      -I${HDRDIR} -I${LIBCXXRTDIR} -std=c++0x -nostdlib -DLIBCXXRT
 
 DPADD=          ${LIBCXXRT}
-LDADD=          -L${.OBJDIR}/../libcxxrt/ -lcxxrt
+LDADD=          -lcxxrt
 LDFLAGS+=       --verbose
 INCSGROUPS=     STD EXT