Remove "unnecessary" whitespace from some tests.

This whitespace was not part of anything being tested, and it
introduces differences (that we don't actually care about) between the
output of "gcc -E" and glcpp.

Just eliminate this extra whitespace to reduce spurious test-case
failures.

tests/015-define-object-with-parens.c

@@ -1,4 +1,4 @@
-#define foo ( ) 1
+#define foo ()1
 foo()
-#define bar () 2
-bar( )
+#define bar ()2
+bar()

tests/016-define-func-1-arg.c

@@ -1,2 +1,2 @@
-#define foo(x) ((x) + 1)
+#define foo(x) ((x)+1)
 foo(bar)

tests/020-define-func-2-arg-multi.c

@@ -1,2 +1,2 @@
-#define foo(x,y) x, two fish, red fish, y
+#define foo(x,y) x,two fish,red fish,y
 foo(one fish, blue fish)

tests/023-define-extra-whitespace.c

@@ -3,6 +3,6 @@
  # define  twoargs( x , y ) x y 
 	#	define	threeargs(	a	,	b	,	c	) a b c 
 noargs ( ) 
- onearg ( 2 ) 
-	twoargs ( 3 , 4 ) 
+onearg ( 2 ) 
+twoargs ( 3 , 4 ) 
 threeargs ( 5 , 6 , 7 ) 

tests/032-define-func-self-recurse.c

@@ -1,2 +1,2 @@
-#define foo(a) foo(2 * (a))
+#define foo(a) foo(2*(a))
 foo(3)

tests/033-define-func-self-compose.c

@@ -1,2 +1,2 @@
-#define foo(a) foo(2 * (a))
+#define foo(a) foo(2*(a))
 foo(foo(3))

tests/035-define-func-self-compose-non-func-multi-token-argument.c

@@ -1,2 +1,2 @@
 #define foo(bar) bar
-foo(1 + foo)
+foo(1+foo)