Use AM_PROG_CC_C_O to support per-target compilation flags.
Use AM_PROG_CC_C_O to support per-target compilation flags.

Fixes an automake warning.

ijsf/OpenWebRTC-orc,MOXfiles/orc,okuoku/nmosh-orc,ijsf/OpenWebRTC-orc,jpakkane/orc,mojaves/orc,ijsf/OpenWebRTC-orc,Distrotech/orc,okuoku/nmosh-orc,ahmedammar/platform_external_gst_liborc,ahmedammar/platform_external_gst_liborc,jpakkane/orc,okuoku/nmosh-orc,MOXfiles/orc,mojaves/orc,MOXfiles/orc,Distrotech/orc,Distrotech/orc,jpakkane/orc,mojaves/orc