libwebp.jar: build w/Java 1.6 for Android compat
libwebp.jar: build w/Java 1.6 for Android compat

broken since:
 a5c297c swig/java: reduce wrapper function code duplication

this was a part of v0.3.1, but not v0.3.0.

Change-Id: I001d4bd0a7a1aa1b2d267bc63bc1d8226bff00c1

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