[Bug #19778] Pass additional include options to INCFLAGS in common.mk

	Alias init functions

	The extension library has each initialization function named "Init_" +
	basename. If multiple extensions have the same base name (such as
	cgi/escape and erb/escape), the same function will be registered for
	both names.

	To fix this conflict, rename the initialization functions under sub
	directories using using parent names, when statically linking.

	[Bug #19967] Reset `LIBPATHENV` env after started

	Not to affect other tools invoked as child processes.
	---
	 common.mk            | 3 ++-
	 template/Makefile.in | 3 +++
	 template/fake.rb.in  | 3 +++
	 tool/fake.rb         | 8 ++++++++
	 4 files changed, 16 insertions(+), 1 deletion(-)

	[Bug #19967] Revert "configure.ac: LIBPATHENV on macOS"

	This reverts commit 1961c786aab243b3eb60e7238224e87975d88056.  These
	environment variables should no longer propagate to child processes.
	---
	 configure.ac | 2 +-
	 1 file changed, 1 insertion(+), 1 deletion(-)

	[Bug #19967] Delete real path

	---
	 tool/fake.rb | 3 ++-
	 1 file changed, 2 insertions(+), 1 deletion(-)

	[Bug #19967] Ignore library before build

	---
	 tool/fake.rb | 2 +-
	 1 file changed, 1 insertion(+), 1 deletion(-)

	[Bug #19751] Remove linemarkers in middle

	---
	 template/fake.rb.in | 1 +
	 1 file changed, 1 insertion(+)

It should depends on only existing data files (except for the tools),
unless `ALWAYS_UPDATE_UNICODE=yes`.