Keep MMX/SSE checks from using the root Makefile

On FreeBSD make(1) is used to check for MMX/SSE, thus the root
Makefile is included. This started being an issue with
$(extra_versioning) not being defined at this stage.

diff --git a/configure b/configure
index 61a9663e0fabde89e0b7920537a7d33d70f6b882..2703b0a84d0ad4b1f4e470a426c9850d19eb3ff6 100755 (executable)
--- a/configure
+++ b/configure
@@ -301,7 +301,7 @@ then
                grep mmx /proc/cpuinfo > /dev/null 2>&1 || mmx=false
                ;;
                FreeBSD)
-               [ "$(make -V MACHINE_CPU:Mmmx)" ] || mmx=false
+               [ "$(make -V MACHINE_CPU:Mmmx -f /dev/null)" ] || mmx=false
                ;;
                *)
                grep mmx /proc/cpuinfo > /dev/null 2>&1 || mmx=false
@@ -320,7 +320,7 @@ then
                grep sse /proc/cpuinfo > /dev/null 2>&1 || sse=false
                ;;
                FreeBSD)
-               [ "$(make -V MACHINE_CPU:Msse)" ] || sse=false
+               [ "$(make -V MACHINE_CPU:Msse -f /dev/null)" ] || sse=false
                ;;
                *)
                grep sse /proc/cpuinfo > /dev/null 2>&1 || sse=false
@@ -339,7 +339,7 @@ then
                grep sse2 /proc/cpuinfo > /dev/null 2>&1 || sse2=false
                ;;
                FreeBSD)
-               [ "$(make -V MACHINE_CPU:Msse2)" ] || sse2=false
+               [ "$(make -V MACHINE_CPU:Msse2 -f /dev/null)" ] || sse2=false
                ;;
                *)
                grep sse2 /proc/cpuinfo > /dev/null 2>&1 || sse2=false