check: add support for running test as standalone

Signed-off-by: Eric Engestrom <eric@engestrom.ch>

src/egl/egl-entrypoint-check

@@ -1,6 +1,11 @@
 #!/usr/bin/env bash
 set -e
 
+if [ -z "$srcdir" ]
+then
+  srcdir=$(dirname "$0")
+fi
+
 entrypoints=$(grep EGL_ENTRYPOINT "$srcdir"/main/eglentrypoint.h)
 sorted=$(sort <<< "$entrypoints")
 test "$entrypoints" = "$sorted"

src/glx/tests/dispatch-index-check

@@ -1,6 +1,11 @@
 #!/usr/bin/env bash
 set -e
 
+if [ -z "$srcdir" ]
+then
+  srcdir=$(dirname "$0")
+fi
+
 # extract enum definition
 dispatch_list=$(sed '/__GLXdispatchIndex/,/__GLXdispatchIndex/!d' \
   "$srcdir"/../g_glxglvnddispatchindices.h)