Use objconv when compiling with Apple's CC
* conf/i386-pc.rmk (efiemu32.o): use OBJCONV if defined
(efiemu64.o): likewise
(efiemu64_c.o): omit -mcmodel=large and add -DAPPLE_CC=1
when compiling with Apple's CC
(efiemu64_s.o): likewise
* configure.ac: check for objconv when compiling with Apple's CC
* genmk.rb: use objconv for modules when compiled with Apple's CC
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