Still more .gitignore cleanup.

Fix overly-enthusiastic ignores, as identified by
git ls-files -i --exclude-standard

src/interfaces/ecpg/test/.gitignore

 /pg_regress
-
-# Exclude all C files in subdirectories
-/*/*.c
-
 # Exclude subdirectories
 /log/
 /results/

src/interfaces/ecpg/test/compat_informix/.gitignore

-# Exclude all non-pgc files
-*
-!*.pgc
+/charfuncs
+/charfuncs.c
+/dec_test
+/dec_test.c
+/describe
+/describe.c
+/rfmtdate
+/rfmtdate.c
+/rfmtlong
+/rfmtlong.c
+/rnull
+/rnull.c
+/sqlda
+/sqlda.c
+/test_informix
+/test_informix.c
+/test_informix2
+/test_informix2.c

src/interfaces/ecpg/test/connect/.gitignore

-# Exclude all non-pgc files
-*
-!*.pgc
+/test1
+/test1.c
+/test2
+/test2.c
+/test3
+/test3.c
+/test4
+/test4.c
+/test5
+/test5.c

src/interfaces/ecpg/test/pgtypeslib/.gitignore

-# Exclude all non-pgc files
-*
-!*.pgc
+/dt_test
+/dt_test.c
+/dt_test2
+/dt_test2.c
+/nan_test
+/nan_test.c
+/num_test
+/num_test.c
+/num_test2
+/num_test2.c

src/interfaces/ecpg/test/preproc/.gitignore

-# Exclude all non-pgc files
-*
-!*.pgc
+/array_of_struct
+/array_of_struct.c
+/autoprep
+/autoprep.c
+/comment
+/comment.c
+/cursor
+/cursor.c
+/define
+/define.c
+/init
+/init.c
+/outofscope
+/outofscope.c
+/strings
+/strings.c
+/type
+/type.c
+/variable
+/variable.c
+/whenever
+/whenever.c

src/interfaces/ecpg/test/sql/.gitignore

-# Exclude all non-pgc files
-*
-!*.pgc
+/array
+/array.c
+/binary
+/binary.c
+/code100
+/code100.c
+/copystdout
+/copystdout.c
+/define
+/define.c
+/desc
+/desc.c
+/describe
+/describe.c
+/dynalloc
+/dynalloc.c
+/dynalloc2
+/dynalloc2.c
+/dyntest
+/dyntest.c
+/execute
+/execute.c
+/fetch
+/fetch.c
+/func
+/func.c
+/indicators
+/indicators.c
+/insupd
+/insupd.c
+/oldexec
+/oldexec.c
+/parser
+/parser.c
+/quote
+/quote.c
+/show
+/show.c
+/sqlda
+/sqlda.c

src/interfaces/ecpg/test/thread/.gitignore

-# Exclude all non-pgc files
-*
-!*.pgc
+/alloc
+/alloc.c
+/descriptor
+/descriptor.c
+/prep
+/prep.c
+/thread
+/thread.c
+/thread_implicit
+/thread_implicit.c