configure: Use --with-system-{gfortran,openssl,python3}=force on Cygwin

[mkoeppe]

to streamline user support

• https://groups.google.com/g/sage-devel/c/_z1Fv_OH1mk
• https://groups.google.com/g/sage-devel/c/JNDU9Fa0Ths

These packages do not build successfully on cygwin. (See #31168 for gfortran)

CC: @dimpase

Component: porting: Cygwin

Author: Matthias Koeppe

Branch: 942639d

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/34216

[mkoeppe]

Branch: u/mkoeppe/configure__use___with_system_python3_force___with_system_openssl_force_on_cygwin

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

Commit: 942639d

[mkoeppe]

Description changed:

--- 
+++ 
@@ -2,4 +2,4 @@
 - https://groups.google.com/g/sage-devel/c/_z1Fv_OH1mk
 - https://groups.google.com/g/sage-devel/c/JNDU9Fa0Ths
 
-
+These packages do not build successfully on cygwin. (See #31168	for gfortran)

[mkoeppe]

New commits:

942639d

build/pkgs/{gfortran,openssl,python3}: On Cygwin, do not try to build the SPKG

[dimpase]

comment:3

lgtm

[dimpase]

Reviewer: Dima Pasechnik

[mkoeppe]

comment:4

Thanks

[vbraun]

Changed branch from u/mkoeppe/configure__use___with_system_python3_force___with_system_openssl_force_on_cygwin to 942639d

[mkoeppe]

Changed commit from 942639d to none