Patch to detect ATLAS or cblas. Ported from 1.0.3 to 1.0.4.

Patch by Marius Brehler.
--- a/configure.ac
+++ b/configure.ac
@@ -76,15 +76,7 @@ location with the options --with-gmp-inc
 respectively when running configure.
 )])
 
-IML_CHECK_CBLAS(,,[AC_MSG_WARN(
-CBLAS not found!
-Please make sure that --with-cblas=<linker flags> and optional --with-cblas-include=<path> and --with-cblas-lib=<path> are correctly set.
-Trying legacy ATLAS configuration.)
-IML_CHECK_ATLAS(,,[AC_MSG_ERROR(
-ATLAS not found! 
-ATLAS version 3.0 or greater is required for this library to compile. Please make sure ATLAS is installed and specify the header and libraries location with the options --with-atlas-include=<path> and --with-atlas-lib=<path> respectively when running configure.)
-])
-])
+PKG_CHECK_MODULES([ATLAS], [cblas])
 
 AC_SUBST(LIBIML_LDFLAGS)
 AC_SUBST(LDFLAGS)