Make our autopkgtest cross-test-friendly

debian/tests/control

@@ -1,3 +1,5 @@
-Depends: libqb-dev, gcc, libc6-dev, pkg-config
+Depends: libqb-dev,
+ build-essential,
+ pkg-config,
 Tests: ipc
 Restrictions: allow-stderr

debian/tests/ipc

@@ -1,14 +1,18 @@
 #!/bin/sh -ex
 
+DEB_HOST_GNU_TYPE=$(dpkg-architecture -q DEB_HOST_GNU_TYPE)
+CC=$DEB_HOST_GNU_TYPE-gcc
+PKG_CONFIG=$DEB_HOST_GNU_TYPE-pkg-config
+
 cd examples
 # the os_base.h in-tree header includes inttypes.h for the examples
 ln -sf /usr/include/inttypes.h os_base.h # -f to enable repeated runs
-gcc $(pkg-config --cflags libqb) \
+$CC $($PKG_CONFIG --cflags libqb) \
     -o ipcserver ipcserver.c \
-    $(pkg-config --libs libqb)
-gcc $(pkg-config --cflags libqb) \
+    $($PKG_CONFIG --libs libqb)
+$CC $($PKG_CONFIG --cflags libqb) \
     -o ipcclient ipcclient.c \
-    $(pkg-config --libs libqb)
+    $($PKG_CONFIG --libs libqb)
 
 OUT="${AUTOPKGTEST_ARTIFACTS:-.}/out.txt"
 ERR="${AUTOPKGTEST_ARTIFACTS:-.}/err.txt"