Revert "Fix for Cygwin's environment build-profile"

This reverts commit "Fix for Cygwin's environment build-profile", as it was
giving errors for "make clean" on some Windows environments. See comments in
https://github.com/official-stockfish/Stockfish/commit/68bf362ea2385a641be9f5ed9ce2acdf55a1ecf1

Possibly somebody can propose a solution that would fix Cygwin builds and
not break on other system too, stay tuned! :-)

No functional change

AUTHORS

@@ -23,7 +23,6 @@ Alfredo Menezes (lonfom169)
 Ali AlZhrani (Cooffe)
 Andrew Grant (AndyGrant)
 Andrey Neporada (nepal)
-Andreï Vetrov (proukornew)
 Andy Duplain
 Antoine Champion (antoinechampion)
 Aram Tumanian (atumanian)

src/Makefile

@@ -884,13 +884,13 @@ clang-profile-use:
 
 gcc-profile-make:
 	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
-	EXTRACXXFLAGS='-fprofile-generate="./"' \
+	EXTRACXXFLAGS='-fprofile-generate' \
 	EXTRALDFLAGS='-lgcov' \
 	all
 
 gcc-profile-use:
 	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
-	EXTRACXXFLAGS='-fprofile-use="./" -fno-peel-loops -fno-tracer' \
+	EXTRACXXFLAGS='-fprofile-use -fno-peel-loops -fno-tracer' \
 	EXTRALDFLAGS='-lgcov' \
 	all