text: Make sure we can autoreconfigure popt
  
  This commit makes a few changes in the popt build system to allow it
  to be autoreconfigured with modern autotools:
  
   - the TESTS variable shouldn't be using $(top_srcdir), and since we
     don't care about tests in Buildroot, we just disable it.
  
   - the AM_C_PROTOTYPES macro is deprecated and should no longer be
     used, causes an error with autoconf/automake.
  
  Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
  
  Index: b/Makefile.am
  ===================================================================
  --- a/Makefile.am
  +++ b/Makefile.am
  @@ -37,8 +37,6 @@
   TESTS_ENVIRONMENT = \
   test1="$(top_builddir)/test1"
   
  -TESTS = $(top_srcdir)/testit.sh
  -
   include_HEADERS = popt.h
   
   usrlibdir = $(libdir)
  Index: b/configure.ac
  ===================================================================
  --- a/configure.ac
  +++ b/configure.ac
  @@ -46,7 +46,6 @@
   AC_SYS_LARGEFILE
   
   AC_ISC_POSIX
  -AM_C_PROTOTYPES
   
   AC_CHECK_HEADERS(float.h fnmatch.h glob.h langinfo.h libintl.h mcheck.h unistd.h)
   
  