Remove workarounds that are not needed with the current versions of sip-build

setup/build.py

@@ -487,7 +487,6 @@ project-factory = "pyqtbuild:PyQtProject"
 
 [tool.sip.project]
 sip-files-dir = "."
-sip-module = "PyQt5.sip"
 
 [tool.sip.bindings.pictureflow]
 headers = {ext.headers}
@@ -524,15 +523,6 @@ sip-file = "{os.path.basename(sipf)}"
         cwd = os.getcwd()
         try:
             os.chdir(os.path.join(src_dir, 'build'))
-            if ext.needs_exceptions:
-                # bug in sip-build
-                for q in walk('.'):
-                    if os.path.basename(q) in ('Makefile',):
-                        with open(q, 'r+') as f:
-                            raw = f.read()
-                            raw = raw.replace('-fno-exceptions', '-fexceptions')
-                            f.seek(0), f.truncate()
-                            f.write(raw)
             self.check_call([self.env.make] + ([] if iswindows else ['-j%d'%(os.cpu_count() or 1)]))
             e = 'pyd' if iswindows else 'so'
             m = glob.glob(f'{ext.name}/{ext.name}.*{e}')