explicitly name the path for the autoconf-generated files in .gitignore.

.gitignore

@@ -1,19 +1,32 @@
 Makefile
 Makefile.in
 autom4te.cache
-aclocal.m4
 config.guess
 config.sub
+config.status
 configure
 depcomp
 install-sh
 ltmain.sh
 missing
 test-driver
+libtool
 compile
+stamp-h1
 stamp-h2
-IlmBaseConfigInternal.h
-OpenEXRConfigInternal.h
+IlmBase/config/IlmBaseConfigInternal.h
+IlmBase/HalfTest/HalfTest
+IlmBase/IexTest/IexTest
+IlmBase/ImathTest/ImathTest
+PyIlmBase/config/PyIlmBaseConfig.h
+PyIlmBase/PyIlmBase.pc
+PyIlmBase/PyIexTest/pyIexTest
+PyIlmBase/PyImathNumpyTest/pyImathNumpyTest
+PyIlmBase/PyImathTest/pyImathTest
+OpenEXR/config/OpenEXRConfigInternal.h
+OpenEXR/IlmImfTest/IlmImfTest
+OpenEXR/IlmImfUtilTest/IlmImfUtilTest
+OpenEXR/IlmImfFuzzTest/IlmImfFuzzTest
 b44ExpLogTable.h
 dwaLookups.h
 eLut
@@ -36,12 +49,6 @@ toFloat.h
 *.project
 *.cproject
 .DS_Store
-HalfTest/
-IexTest/
-ImathTest/
-IlmImfTest/
-IlmImfUtilTest/
-IlmImfFuzzTest/
 build/
 build-win/
 build-nuget/