Drop the x's from shell tests

Partly just to give us an extra commit to test the versioning,
but they really aren't needed in any of those cases, and now
we're consistent about not using them everywhere.

configure.ac

@@ -58,13 +58,13 @@ case $host in
     host_mingw=true
     ;;
 esac
-AM_CONDITIONAL(OP_WIN32, test "x$host_mingw" = xtrue)
+AM_CONDITIONAL(OP_WIN32, test "$host_mingw" = "true")
 
 AC_ARG_ENABLE([assertions],
   AS_HELP_STRING([--enable-assertions], [Enable assertions in code]),,
   enable_assertions=no)
 
-AS_IF([test "x$enable_assertions" = "xyes"], [
+AS_IF([test "$enable_assertions" = "yes"], [
   AC_DEFINE([OP_ENABLE_ASSERTIONS], [1], [Enable assertions in code])
 ])
 
@@ -73,13 +73,13 @@ AC_ARG_ENABLE([http],
   enable_http=yes)
 
 AM_COND_IF(OP_WIN32,
-  AS_IF([test "x$enable_http" != "xno"],
+  AS_IF([test "$enable_http" != "no"],
     AC_CHECK_HEADER([winsock2.h],,
       AC_MSG_WARN([HTTP support requires a Winsock socket library.])
       enable_http=no
     )
   ),
-  AS_IF([test "x$enable_http" != "xno"],
+  AS_IF([test "$enable_http" != "no"],
     AC_CHECK_HEADER([sys/socket.h],,
       AC_MSG_WARN([HTTP support requires a POSIX socket library.])
       enable_http=no
@@ -87,12 +87,12 @@ AM_COND_IF(OP_WIN32,
   )
 )
 
-AS_IF([test "x$enable_http" != "xno"], [
+AS_IF([test "$enable_http" != "no"], [
    openssl="openssl"
    AC_DEFINE([OP_ENABLE_HTTP], [1], [Enable HTTP support])
    PKG_CHECK_MODULES([URL_DEPS], [openssl])
 ])
-AM_CONDITIONAL(OP_ENABLE_HTTP, [test "x$enable_http" != "xno"])
+AM_CONDITIONAL(OP_ENABLE_HTTP, [test "$enable_http" != "no"])
 AC_SUBST([openssl])
 
 PKG_CHECK_MODULES([DEPS], [ogg >= 1.3 opus >= 1.0.1])
@@ -104,13 +104,13 @@ AC_ARG_ENABLE([float],
   AS_HELP_STRING([--disable-float], [Disable floating-point API]),,
   enable_float=yes)
 
-AS_IF([test "x$enable_float" = "xno"],
+AS_IF([test "$enable_float" = "no"],
   [enable_fixed_point=yes
    AC_DEFINE([OP_DISABLE_FLOAT_API], [1], [Disable floating-point API])
   ]
 )
 
-AS_IF([test "x$enable_fixed_point" = "xyes"],
+AS_IF([test "$enable_fixed_point" = "yes"],
   [AC_DEFINE([OP_FIXED_POINT], [1], [Enable fixed-point calculation])],
   [dnl This only has to be tested for if float->fixed conversions are required
    AC_SEARCH_LIBS([lrintf], [m], [
@@ -121,7 +121,7 @@ AS_IF([test "x$enable_fixed_point" = "xyes"],
   ]
 )
 lrintf_lib="$ac_cv_search_lrintf"
-AS_IF([test "x$ac_cv_search_lrintf" = "xnone required"],
+AS_IF([test "$ac_cv_search_lrintf" = "none required"],
   [lrintf_lib=""]
 )
 AC_SUBST(lrintf_lib)