pkg/56503: ffmpeg4 build failure on Solaris 10 (ffbuild/pkgconfig_generate.sh)

[pekdon%gmail.com@localhost]

>Number:         56503
>Category:       pkg
>Synopsis:       ffmpeg4 build failure on Solaris 10 (ffbuild/pkgconfig_generate.sh)
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Nov 16 11:20:00 +0000 2021
>Originator:     Claes Nästén
>Release:        trunk 2021-11-02
>Organization:
>Environment:
SunOS 5.10 i86pc i386 i86pc
>Description:
multimedia/ffmpeg4 fails to build on Solaris 10 when executing ffbuild/pkgconfig_generate.sh due to the following error:

./ffbuild/pkgconfig_generate.sh: syntax error at line 15: `libs=$' unexpected

>How-To-Repeat:
Build multimedia/ffmpeg4 on Solaris 10.
>Fix:
Add ffbuild/pkgconfig_generate.sh to REPLACE_SH of multimedia/ffmpeg4/Makefile.common