configure.ac: Enable the automake -Wall option

This patch fixes the following automake warnings:

/usr/share/automake-1.16/am/ltlibrary.am: warning: 'libf2fs.la': linking libtool libraries using a non-POSIX
/usr/share/automake-1.16/am/ltlibrary.am: archiver requires 'AM_PROG_AR' in 'configure.ac'
lib/Makefile.am:3:   while processing Libtool library 'libf2fs.la'
/usr/share/automake-1.16/am/ltlibrary.am: warning: 'libf2fs_format.la': linking libtool libraries using a non-POSIX
/usr/share/automake-1.16/am/ltlibrary.am: archiver requires 'AM_PROG_AR' in 'configure.ac'
mkfs/Makefile.am:11:   while processing Libtool library 'libf2fs_format.la'

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
1 file changed