Build tools with Meson as well

tools/.gitignore

@@ -1,5 +0,0 @@
-/pnginfo
-/jpeginfo
-/tiffinfo
-/webpinfo
-/bmffinfo

tools/Makefile

@@ -1,15 +0,0 @@
-SHELL = /bin/sh
-# libjq 1.6 lacks a pkg-config file, and there is no release in sight.
-# libjq 1.6 is required.
-CFLAGS = -g -O2 -Wall -Wextra `pkg-config --cflags $(deps)`
-LDLIBS = -ljq `pkg-config --libs $(deps)`
-
-deps = libpng
-targets = pnginfo jpeginfo tiffinfo webpinfo bmffinfo
-
-all: $(targets)
-$(targets): info.h
-clean:
-	rm -f $(targets)
-
-.PHONY: all clean

tools/clean-up-thumbnail-cache.sh

@@ -1,6 +1,6 @@
 #!/bin/sh -e
 # Remove thumbnails with URIs pointing to at this moment non-existing files.
-make pnginfo
+ninja pnginfo
 
 pnginfo=$(pwd)/pnginfo cache_home=${XDG_CACHE_HOME:-$HOME/.cache}
 for size in normal large x-large xx-large; do