Tests/Find{BLAS,LAPACK}: Comment purpose of integer size fallback

Tests/FindBLAS/Test/CMakeLists.txt

@@ -4,6 +4,9 @@ include(CTest)
 
 find_package(BLAS REQUIRED)
 
+# Configure the test case to match BLAS's integer type ABI.
+# FindBLAS defaults to 32-bit integers if BLA_SIZEOF_INTEGER
+# is not already set in the cache.
 if(NOT BLA_SIZEOF_INTEGER)
   set(BLA_SIZEOF_INTEGER 4)
 endif()

Tests/FindLAPACK/Test/CMakeLists.txt

@@ -4,6 +4,9 @@ include(CTest)
 
 find_package(LAPACK REQUIRED)
 
+# Configure the test case to match LAPACK's integer type ABI.
+# FindLAPACK defaults to 32-bit integers if BLA_SIZEOF_INTEGER
+# is not already set in the cache.
 if(NOT BLA_SIZEOF_INTEGER)
   set(BLA_SIZEOF_INTEGER 4)
 endif()