pkg/60465: libquadmath: packages can't find headers

["jnemeth@i386devel.localdomain via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         60465
>Category:       pkg
>Synopsis:       libquadmath: packages can't find headers
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 20 06:50:00 +0000 2026
>Originator:     John Nemeth
>Release:        NetBSD 11.99.5
>Organization:
>Environment:
System: NetBSD i386devel 11.99.5 NetBSD 11.99.5 (GENERIC) #4: Sun Mar 8 03:44:15 PDT 2026 jnemeth@curbuild:/usr/local/NetBSD-current/amd64-objdir/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:
	Packages using libquadmath can't find the headers.
>How-To-Repeat:
	Add a dependency for libquadmath and put "#include <quadmath.h> in a source file.
>Fix:
	Change it so that headers are stored in ${PREFIX}/usr/include.