Use generic files for i386 build

--- a/Makefile.am
+++ b/Makefile.am
@@ -64,8 +64,7 @@
 endif
 
 if CPU_X86_32
-libisal_la_SOURCES += ${lsrc_x86_32}
-other_tests += ${other_tests_x86_32}
+libisal_la_SOURCES += ${lsrc_base_aliases}
 endif
 
 if CPU_AARCH64