The check_lib function does not seem able to detect vulkan on windows,
this replaces a hack in Makefile.common that does the same, but while allowing
C89_BUILD=1 and --disable-vulkan to work.
LD retroarch
obj-unix/./libretro-common/net/net_natt.o: In function `natt_open_port':
/RetroArch/libretro-common/net/net_natt.c:120: undefined reference to `UPNP_AddAnyPortMapping'
/RetroArch/libretro-common/net/net_natt.c:133: undefined reference to `UPNP_GetExternalIPAddress'
/RetroArch/libretro-common/net/net_natt.c:126: undefined reference to `UPNP_AddPortMapping'
obj-unix/./libretro-common/net/net_natt.o: In function `natt_init':
/RetroArch/libretro-common/net/net_natt.c:61: undefined reference to `upnpDiscover'
/RetroArch/libretro-common/net/net_natt.c:74: undefined reference to `miniwget'
/RetroArch/libretro-common/net/net_natt.c:77: undefined reference to `parserootdesc'
/RetroArch/libretro-common/net/net_natt.c:79: undefined reference to `GetUPNPUrls'
/RetroArch/libretro-common/net/net_natt.c:81: undefined reference to `freeUPNPDevlist'
collect2: error: ld returned 1 exit status
make: *** [Makefile:159: retroarch] Error 1
This is a proof of concept for the fallback path without pkg-config.
As jack is something often not installed by default it demonstrates
that when pkg-config exists and the dependency doesn't the check_val
function in qb/qb.libs.sh will redundantly check -ljack and as expected,
fail. It also shows that when pkg-config is not installed and jack is
enabled with --enable-jack it will bail and print a configure error.
This accomplishes two things for the fallback path without pkg-config.
1. If --disable-foo is passed to configure it will explicitly skip
check_val. This has the benefit of reducing checks in
qb/config.libs.sh which are easy to break due to human error.
2. When a fallback path exists and --enable-foo is passed to configure,
but fails due to the missing -lfoo check_val will now bail and print
a configure error. However --enable-foo will still be ignored if
there is no fallback path and pkg-config is not installed.
One issue with this is that if pkg-config is installed and the package
foo is not, it will still check if -lfoo works. As not all pkg-config
implemenations can be trusted to work even if they exist this seems
unavoidable.
This resolves an issue where the default freebsd compiler does not
include /usr/local/include which contains important headers such as
GL/gl.h and results in the check_header function failing to find them.
Unfortunately pkg-config/pkgconf will not work here for two reasons.
1. It does not seem able to actually check for gl.h which RetroArch
explicitly needs.
2. Not all systems have a pkg-config implementation so we will still
have to fall back to checking for gl.h...
Fixes https://github.com/libretro/RetroArch/issues/5958
