xhyverun-*.sh: Update execution to search build dirs and $PATH for xhyve

This should allow these scripts to be more easily used for Makefile-based
development builds, xcodebuild-based builds, or installed executables.

Signed-off-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>

xhyverun-freebsd.sh

@@ -3,7 +3,9 @@
 BOOTVOLUME="<path of FreeBSD iso>"
 IMG="<path of disk image for FreeBSD>"
 
-build/xhyve \
+PATH="build/Release:build:$PATH"
+
+xhyve \
     -A \
     -m 2G \
     -c 2 \

xhyverun-tinycorelinux.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
-build/xhyve \
+PATH="build/Release:build:$PATH"
+
+xhyve \
     -A \
     -m 1G \
     -s 0:0,hostbridge \

xhyverun-windows.sh

@@ -4,7 +4,9 @@ BOOTVOLUME="<path of Windows iso>"
 IMG="<path of disk image for Windows>"
 FIRMWARE="<path of BHYVE_UEFI.fd>"
 
-build/xhyve \
+PATH="build/Release:build:$PATH"
+
+xhyve \
     -w \
     -m 4G \
     -c 2 \