dtrace.pc, dtrace_sdt.pc: whitespace makes pkgconf --validate complain

[thesamesam]

$ pkgconf --validate /usr/share/pkgconfig/dtrace.pc
/usr/share/pkgconfig/dtrace.pc:1: warning: whitespace encountered while parsing key section
/usr/share/pkgconfig/dtrace.pc:2: warning: whitespace encountered while parsing key section
/usr/share/pkgconfig/dtrace.pc:3: warning: whitespace encountered while parsing key section

$ pkgconf --validate /usr/share/pkgconfig/dtrace_sdt.pc
/usr/share/pkgconfig/dtrace_sdt.pc:1: warning: whitespace encountered while parsing key section
/usr/share/pkgconfig/dtrace_sdt.pc:2: warning: whitespace encountered while parsing key section

It dislikes this (i.e. the spaces around =):

includedir = /usr/include
libdir = @LIBDIR@
dtrace = /usr/sbin/dtrace