Another speculative fix for 'pkg-config' sometimes getting built as a…

… 32-bit package regardless of arch configuration

Mono issue: mono/mono#13804

The hypothesis is that at reconfigure using the configure cache file, the lack of explicit setting of the host somehow breaks the build process.

bockbuild/darwinprofile.py

@@ -139,12 +139,12 @@ def arch_build(self, arch, package):
             package.local_ld_flags = ['-arch i386', '-m32']
             package.local_gcc_flags = ['-arch i386', '-m32']
             package.local_configure_flags = [
-                '--build=i386-apple-darwin13.0.0', '--disable-dependency-tracking']
+                '--build=i386-apple-darwin13.0.0', '--host=i386-apple-darwin13.0.0', '--disable-dependency-tracking']
         elif arch == 'darwin-64':
             package.local_ld_flags = ['-arch x86_64 -m64']
             package.local_gcc_flags = ['-arch x86_64 -m64']
             package.local_configure_flags = [
-                '--build=x86_64-apple-darwin13.0.0', '--disable-dependency-tracking']
+                '--build=x86_64-apple-darwin13.0.0', '--host=x86_64-apple-darwin13.0.0', '--disable-dependency-tracking']
         else:
             error('Unknown arch %s' % arch)