Remove -browse command line option

This option was undocumented.  If used it quietly did nothing
unless you'd installed the SWILL library before building SWIG, but
SWILL is no longer maintained and hasn't seen a release since
2008-04-10.

It's clear nobody has used this functionality for some time as the
code to support it in SWIG isn't actually valid ISO C++:

Modules/browser.cxx: In member function ‘void Browser::show_attributes(Node*)’:
Modules/browser.cxx:57:23: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings]
57 |         char *trunc = "";
   |                       ^~
Modules/browser.cxx:61:21: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings]
61 |             trunc = "...";
   |                     ^~~~~

Closes #2251

Source/Makefile.am

@@ -6,8 +6,6 @@ AUTOMAKE_OPTIONS = foreign nostdinc subdir-objects 1.7.2
 SOURCE_DIR=$(top_srcdir)/Source
 BUILD_SOURCE_DIR=$(top_builddir)/Source
 
-SWIG_CXX_DEFS = @SWILL@
-
 AM_CPPFLAGS =	-I$(BUILD_SOURCE_DIR)/Include	\
 		-I$(BUILD_SOURCE_DIR)/CParse	\
 		-I$(SOURCE_DIR)/Include		\
@@ -18,7 +16,7 @@ AM_CPPFLAGS =	-I$(BUILD_SOURCE_DIR)/Include	\
 		-I$(SOURCE_DIR)/Swig		\
 		-I$(SOURCE_DIR)/Modules
 
-AM_CXXFLAGS =	$(SWIG_CXX_DEFS)
+AM_CXXFLAGS =
 
 AM_YFLAGS = -d
 
@@ -46,7 +44,6 @@ eswig_SOURCES =	CParse/cscanner.c		\
 		Doxygen/pydoc.cxx		\
 		Doxygen/pydoc.h			\
 		Modules/allocate.cxx		\
-		Modules/browser.cxx		\
 		Modules/contract.cxx		\
 		Modules/csharp.cxx		\
 		Modules/d.cxx			\
@@ -98,7 +95,6 @@ eswig_SOURCES =	CParse/cscanner.c		\
 		Swig/wrapfunc.c
 
 bin_PROGRAMS = eswig
-eswig_LDADD   = @SWIGLIBS@
 
 # Override the link stage to avoid using Libtool
 CXXLINK = $(CXXLD) $(AM_CXXFLAGS) $(CXXFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@