fix gcc-4.0 apple 32-bit build
fix gcc-4.0 apple 32-bit build

gcc-4.0 defines __PIC__ but not __pic__. This leaves the test for
__pic__ should the inverse case exist.
Fixes issue #103; build failing with:
"error: can't find a register in class 'BREG' while reloading 'asm'"

Change-Id: Ia767a733de6ce0294146f9477ff9c46f0ebe13b0

kalli123/webm.libwebp,zofuthan/libwebp,yohunl/libwebp,rxl194/libwebp,reimaginemedia/webm.libwebp,kalli123/webm.libwebp,imazen/libwebp,yohunl/libwebp,Maria1099/webm.libwebp,Maria1099/webm.libwebp,redengineer/libwebp,keane83/BLE_IM,comoyo/gonzo-libwebp,rxl194/libwebp,Tekserve/libwebp,kalli123/webm.libwebp,ttyangf/libwebp,ya7lelkom/libwebp,dumganhar/libwebp,zofuthan/libwebp,ya7lelkom/libwebp,abwiz0086/webm.libwebp,PKRoma/libwebp,kleopatra999/webm.libwebp,Distrotech/libwebp,rxl194/libwebp,appunite/libwebp,ttyangf/libwebp,altogother/webm.libwebp,keane83/BLE_IM,appunite/libwebp,Tekserve/libwebp,Maria1099/webm.libwebp,jacklicn/libwebp,keane83/BLE_IM,webmproject/libwebp,matanbs/webm.libwebp,redengineer/libwebp,yohunl/libwebp,ericmckean/webm.libwebp,comoyo/gonzo-libwebp,ttyangf/libwebp,webmproject/libwebp,Acidburn0zzz/webm.libwebp,Acidburn0zzz/webm.libwebp,ttyangf/libwebp,ttyangf/libwebp,comoyo/gonzo-libwebp,Tekserve/libwebp,comoyo/gonzo-libwebp,iniwf/webm.libwebp,cysp/libwebp,kalli123/webm.libwebp,gshORTON/webm.libwebp,zofuthan/libwebp,abwiz0086/webm.libwebp,yohunl/libwebp,Distrotech/libwebp,redengineer/libwebp,gshORTON/webm.libwebp,appunite/libwebp,Acidburn0zzz/webm.libwebp,kim42083/webm.libwebp,ya7lelkom/libwebp,reimaginemedia/webm.libwebp,kim42083/webm.libwebp,kim42083/webm.libwebp,webmproject/libwebp,Maria1099/webm.libwebp,ericmckean/webm.libwebp,rxl194/libwebp,jiehu5114/libwebp,Tekserve/libwebp,Distrotech/libwebp,ya7lelkom/libwebp,PKRoma/libwebp,reimaginemedia/webm.libwebp,kleopatra999/webm.libwebp,ericmckean/webm.libwebp,dumganhar/libwebp,redengineer/libwebp,imazen/libwebp,gshORTON/webm.libwebp,Suvarna1488/webm.libwebp,keane83/BLE_IM,dumganhar/libwebp,Suvarna1488/webm.libwebp,comoyo/gonzo-libwebp,iniwf/webm.libwebp,Suvarna1488/webm.libwebp,yohunl/libwebp,jacklicn/libwebp,matanbs/webm.libwebp,ericmckean/webm.libwebp,jacklicn/libwebp,ya7lelkom/libwebp,jiehu5114/libwebp,Aexyn/libwebp,kleopatra999/webm.libwebp,cysp/libwebp,webmproject/libwebp,Aexyn/libwebp,matanbs/webm.libwebp,zofuthan/libwebp,gshORTON/webm.libwebp,PKRoma/libwebp,redengineer/libwebp,kim42083/webm.libwebp,altogother/webm.libwebp,kalli123/webm.libwebp,PKRoma/libwebp,PKRoma/libwebp,keane83/BLE_IM,matanbs/webm.libwebp,iniwf/webm.libwebp,cysp/libwebp,reimaginemedia/webm.libwebp,altogother/webm.libwebp,gshORTON/webm.libwebp,appunite/libwebp,zofuthan/libwebp,Aexyn/libwebp,imazen/libwebp,Acidburn0zzz/webm.libwebp,matanbs/webm.libwebp,altogother/webm.libwebp,abwiz0086/webm.libwebp,jacklicn/libwebp,kleopatra999/webm.libwebp,kim42083/webm.libwebp,appunite/libwebp,Suvarna1488/webm.libwebp,jiehu5114/libwebp,Acidburn0zzz/webm.libwebp,Aexyn/libwebp,kleopatra999/webm.libwebp,cysp/libwebp,abwiz0086/webm.libwebp,iniwf/webm.libwebp,imazen/libwebp,abwiz0086/webm.libwebp,appunite/libwebp,imazen/libwebp,iniwf/webm.libwebp,Maria1099/webm.libwebp,comoyo/gonzo-libwebp,Aexyn/libwebp,jiehu5114/libwebp,webmproject/libwebp,PKRoma/libwebp,altogother/webm.libwebp,comoyo/gonzo-libwebp,jiehu5114/libwebp,rxl194/libwebp,jacklicn/libwebp,reimaginemedia/webm.libwebp,ericmckean/webm.libwebp,Suvarna1488/webm.libwebp