autoconf: update ax_pthread.m4
autoconf: update ax_pthread.m4

from git://git.savannah.gnu.org/autoconf-archive.git
100644 blob d383ad5c6d6a5061370800bb1dc89b7a334c0638	m4/ax_pthread.m4

dd94691 AX_PTHREAD: add support for Clang
386b290 AX_PTHREAD: fix support for AIX
e40cfd6 AX_PTHREAD: improve support for AIX

Change-Id: Ic1f1edc656e4e917b88f151493147f650b94242f

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