Replace tabs with spaces

Author: brianhlin

Makefile

@@ -1,14 +1,14 @@
 sources = isrgrootx1.signing_policy \
           letsencryptauthorityx3.signing_policy \
           letsencryptauthorityx4.signing_policy \
-	  lets-encrypt-r3.signing_policy \
-	  lets-encrypt-r4.signing_policy \
+          lets-encrypt-r3.signing_policy \
+          lets-encrypt-r4.signing_policy \
 
 targets = 23c2f850.signing_policy 4042bcee.signing_policy \
           4a0a35c0.signing_policy 4f06f81d.signing_policy \
           6187b673.signing_policy 929e297e.signing_policy \
-	  8d33f237.signing_policy dec71a0b.signing_policy \
-	  9f194ecd.signing_policy dd7d39a7.signing_policy \
+          8d33f237.signing_policy dec71a0b.signing_policy \
+          9f194ecd.signing_policy dd7d39a7.signing_policy \
           23c2f850.0 4042bcee.0 4a0a35c0.0 4f06f81d.0 6187b673.0 8d33f237.0 929e297e.0 9f194ecd.0 dec71a0b.0 dd7d39a7.0 \
           isrgrootx1.pem \
           letsencryptauthorityx3.pem letsencryptauthorityx4.pem \