Enable BSD_CRTBEGIN on powerpc

In r342974 jhibbits added support to build crtsavres.o. This was the
blocker for BSD_CRTBEGIN to be enabled there. As such enable this
option again.

Reviewed by:	jhibbits
Sponsored by:	DARPA, AFRL

share/mk/src.opts.mk

@@ -394,8 +394,8 @@ BROKEN_OPTIONS+=HYPERV
 BROKEN_OPTIONS+=NVME
 .endif
 
-# PowerPC and Sparc64 need extra crt*.o files
-.if ${__T:Mpowerpc*} || ${__T:Msparc64}
+# Sparc64 need extra crt*.o files
+.if ${__T:Msparc64}
 BROKEN_OPTIONS+=BSD_CRTBEGIN
 .endif