gitignore: updated cmake paths

* files.txt: v2.1.0rc0-2918-g2e23b50 ("Add checkAPI calls to CMake.")
* epan: v2.1.0rc0-2202-g6b54fbf ("CMake: Add more structure to
  libwireshark build")
* asn1: v2.1.0rc0-2330-g54a520d ("Move /asn1 to /epan/dissectors")

Change-Id: I0ef590de7d262d96c011be360b958fbda72a61fa
Reviewed-on: https://code.wireshark.org/review/15961
Reviewed-by: Peter Wu <peter@lekensteyn.nl>

.gitignore

@@ -126,7 +126,8 @@ CPackSourceConfig.cmake
 lib/
 WiresharkConfig.cmake
 WiresharkConfigVersion.cmake
-epan/_regc.tmp
+epan/dissectors/_regc.tmp
+epan/dissectors/files.txt
 wireshark.pc
 run/
 tshark-tap-register-cache.pkl
@@ -134,7 +135,7 @@ build.ninja
 rules.ninja
 .ninja_deps
 .ninja_log
-asn1/*/*-stamp
+epan/dissectors/asn1/*/*-stamp
 
 
 # Generated dir #