component/openblas: put `build-common-options` in one line

slapos.recipe.cmmi executes command lines by line, so this build options
were ignored.

component/openblas/buildout.cfg

@@ -10,8 +10,7 @@ recipe = slapos.recipe.cmmi
 url = http://github.com/xianyi/OpenBLAS/archive/v0.2.15.tar.gz
 md5sum = b1190f3d3471685f17cfd1ec1d252ac9
 
-build-common-options =
-  BINARY="$(uname -m | grep -q x86_64 && echo 64 || echo 32)" NO_STATIC=1 USE_OPENMP=1 USE_THREAD=1
+build-common-options = BINARY="$(uname -m | grep -q x86_64 && echo 64 || echo 32)" NO_STATIC=1 USE_OPENMP=1 USE_THREAD=1
 
 # You can specify more options with openblas:build-ext-options parameter.
 # Example :