configure: add AM_PROG_AR
This fixes:
| automake: warnings are treated as errors
| /build/v2012.12/build/tmp-angstrom_v2012_12-eglibc/sysroots/x86_64-linux/usr/share/automake-1.12/am/ltlibrary.am: warning: 'libgadget.la': linking libtool libraries using a non-POSIX
| /build/v2012.12/build/tmp-angstrom_v2012_12-eglibc/sysroots/x86_64-linux/usr/share/automake-1.12/am/ltlibrary.am: archiver requires 'AM_PROG_AR' in 'configure.ac'
| src/Makefile.am:1: while processing Libtool library 'libgadget.la'
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
projects / platform / upstream / libusbg.git / commit